Update Elixir version

.gitignore

@@ -1 +1,4 @@
-_build
+/_build
+/deps
+erl_crash.dump
+*.ez

.travis.yml

@@ -1,8 +1,14 @@
 language: erlang
+env:
+  - ELIXIR="v0.14.2"
 otp_release:
   - 17.0
 before_install:
-  - git clone https://github.com/elixir-lang/elixir
-  - make -C elixir
-before_script: "export PATH=`pwd`/elixir/bin:$PATH"
-script: "mix test"
+  - mkdir -p vendor/elixir
+  - wget -q https://github.com/elixir-lang/elixir/releases/download/$ELIXIR/Precompiled.zip && unzip -qq Precompiled.zip -d vendor/elixir
+  - export PATH="$PATH:$PWD/vendor/elixir/bin"
+  - mix local.hex --force
+  - mix local.rebar
+script:
+  - mix deps.get
+  - mix test

config/config.exs

@@ -0,0 +1,24 @@
+# This file is responsible for configuring your application and
+# its dependencies. It must return a keyword list containing the
+# application name and have as value another keyword list with
+# the application key-value pairs.
+
+# Note this configuration is loaded before any dependency and is
+# restricted to this project. If another project depends on this
+# project, this file won't be loaded nor affect the parent project.
+
+# You can customize the configuration path by setting :config_path
+# in your mix.exs file. For example, you can emulate configuration
+# per environment by setting:
+#
+#     config_path: "config/#{Mix.env}.exs"
+#
+# Changing any file inside the config directory causes the whole
+# project to be recompiled.
+
+# Sample configuration:
+#
+# [dep1: [key: :value],
+#  dep2: [key: :value]]
+
+[]