simplify travis

.travis.yml

@@ -1,17 +1,22 @@
-
 language: elixir
 elixir:
   - 1.8
 
 services:
   - docker
 
-install:
-  - docker-compose build
+before_script:
+  - docker run --name test_mssql_server -e 'ACCEPT_EULA=Y' -e SA_PASSWORD='ThePa$$word' -p 1433:1433 -d microsoft/mssql-server-linux
+  - ./bash_scripts/wait-for-it.sh localhost:1433
+  - mix local.rebar
+  - rm -rf deps
+  - rm -rf _build
+  - mix deps.get
+  - mix
 
 script:
-  - docker-compose run mssql_ecto mix compile --warnings-as-errors
-  - docker-compose run mssql_ecto mix coveralls.travis
+  - mix compile --warnings-as-errors
+  - mix coveralls.travis
 
 after_script:
   - mix local.hex --force