Added `coveralls` support. (#11)

Changes:
1. Added `deps`
2. Refactored `.travis.yml` with multiple elixir versions and pushing stats to coveralls.io
3. Added coverage badge to `README.md`
4. Added ignore pattern for `cover/` folder

5 files changed, 32 insertions, 9 deletions

diff --git a/.gitignore b/.gitignore
index 571f7e9..bd69ce7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 erl_crash.dump
 /deps
 /doc
+/cover
diff --git a/.travis.yml b/.travis.yml
index 7d38ef9..eea98d0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,12 @@
 language: elixir
+sudo: false
+
 elixir:
+  - 1.2.6
   - 1.3.2
 
-script: mix test && mix credo --strict
+env: MIX_ENV=test
+
+script:
+  - mix coveralls.html && mix credo --strict
+  - mix coveralls.travis
diff --git a/README.md b/README.md
index bc4a04d..dce5a7e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Recaptcha
 
-![Build Status](https://travis-ci.org/samueljseay/recaptcha.svg?branch=master)
+![Build Status](https://travis-ci.org/samueljseay/recaptcha.svg?branch=master) ![Coverage Status](https://coveralls.io/repos/github/samueljseay/recaptcha/badge.svg?branch=master)
 
 A simple Elixir package for implementing [reCAPTCHA] in Elixir applications.
 
diff --git a/mix.exs b/mix.exs
index eb0106e..dcb823b 100644
--- a/mix.exs
+++ b/mix.exs
@@ -2,12 +2,23 @@ defmodule Recaptcha.Mixfile do
   use Mix.Project
 
   def project do
-    [app: :recaptcha,
-     version: "2.0.1",
-     elixir: "~> 1.2",
-     description: description,
-     deps: deps,
-     package: package]
+    [
+      app: :recaptcha,
+      version: "2.0.1",
+      elixir: "~> 1.2",
+      description: description(),
+      deps: deps(),
+      package: package(),
+
+      # Test coverage:
+      test_coverage: [tool: ExCoveralls],
+      preferred_cli_env: [
+        "coveralls": :test,
+        "coveralls.detail": :test,
+        "coveralls.post": :test,
+        "coveralls.html": :test,
+      ],
+   ]
   end
 
   def application do
@@ -26,7 +37,8 @@ defmodule Recaptcha.Mixfile do
       {:httpoison, "~> 0.9.0"},
       {:poison, "~> 1.5 or ~> 2.0"},
       {:credo, "~> 0.4", only: [:dev, :test]},
-      {:ex_doc, ">= 0.0.0", only: :dev}
+      {:ex_doc, ">= 0.0.0", only: :dev},
+      {:excoveralls, "~> 0.5", only: :test},
     ]
   end
 
diff --git a/mix.lock b/mix.lock
index 85d6fec..5faaf78 100644
--- a/mix.lock
+++ b/mix.lock
@@ -3,11 +3,14 @@
   "credo": {:hex, :credo, "0.4.11", "03a64e9d53309b7132556284dda0be57ba1013885725124cfea7748d740c6170", [:mix], [{:bunt, "~> 0.1.6", [hex: :bunt, optional: false]}]},
   "earmark": {:hex, :earmark, "1.0.1", "2c2cd903bfdc3de3f189bd9a8d4569a075b88a8981ded9a0d95672f6e2b63141", [:mix], []},
   "ex_doc": {:hex, :ex_doc, "0.13.0", "aa2f8fe4c6136a2f7cfc0a7e06805f82530e91df00e2bff4b4362002b43ada65", [:mix], [{:earmark, "~> 1.0", [hex: :earmark, optional: false]}]},
+  "excoveralls": {:hex, :excoveralls, "0.5.6", "35a903f6f78619ee7f951448dddfbef094b3a0d8581657afaf66465bc930468e", [:mix], [{:exjsx, "~> 3.0", [hex: :exjsx, optional: false]}, {:hackney, ">= 0.12.0", [hex: :hackney, optional: false]}]},
+  "exjsx": {:hex, :exjsx, "3.2.0", "7136cc739ace295fc74c378f33699e5145bead4fdc1b4799822d0287489136fb", [:mix], [{:jsx, "~> 2.6.2", [hex: :jsx, optional: false]}]},
   "hackney": {:hex, :hackney, "1.6.1", "ddd22d42db2b50e6a155439c8811b8f6df61a4395de10509714ad2751c6da817", [:rebar3], [{:certifi, "0.4.0", [hex: :certifi, optional: false]}, {:idna, "1.2.0", [hex: :idna, optional: false]}, {:metrics, "1.0.1", [hex: :metrics, optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, optional: false]}, {:ssl_verify_fun, "1.1.0", [hex: :ssl_verify_fun, optional: false]}]},
   "httpoison": {:hex, :httpoison, "0.9.1", "6c2b4eaf2588a6f3ef29663d28c992531ca3f0bc832a97e0359bc822978e1c5d", [:mix], [{:hackney, "~> 1.6.0", [hex: :hackney, optional: false]}]},
   "httpotion": {:hex, :httpotion, "2.1.0"},
   "ibrowse": {:git, "https://github.com/cmullaparthi/ibrowse.git", "ea3305d21f37eced4fac290f64b068e56df7de80", [tag: "v4.1.2"]},
   "idna": {:hex, :idna, "1.2.0", "ac62ee99da068f43c50dc69acf700e03a62a348360126260e87f2b54eced86b2", [:rebar3], []},
+  "jsx": {:hex, :jsx, "2.6.2", "213721e058da0587a4bce3cc8a00ff6684ced229c8f9223245c6ff2c88fbaa5a", [:mix, :rebar], []},
   "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], []},
   "mimerl": {:hex, :mimerl, "1.0.2", "993f9b0e084083405ed8252b99460c4f0563e41729ab42d9074fd5e52439be88", [:rebar3], []},
   "poison": {:hex, :poison, "2.2.0", "4763b69a8a77bd77d26f477d196428b741261a761257ff1cf92753a0d4d24a63", [:mix], []},