Simplify travis.yml

Simplify travis.yml using native elixir support.

Author: lowks

.travis.yml

@@ -1,19 +1,11 @@
-language: erlang
+language: elixir
+elixir: 1.0.0
 otp_release:
   - 17.0
   - 17.1
   - 17.3
-env:
-  - ELIXIR="1.0.0"
-before_install:
-  - wget http://s3.hex.pm/builds/elixir/v$ELIXIR.zip
-  - unzip -d elixir v$ELIXIR.zip
 before_script:
-  - export PATH=`pwd`/elixir/bin:$PATH
-  - mix local.hex --force
   - "MIX_ENV=test mix do deps.get, compile"
-script:
-  - mix test
 after_success:
   - MIX_ENV=test mix coveralls.travis
   - MIX_ENV=docs mix deps.get