Rename _main_controller.js to _main-controller.js

To keep with recommended Angular file naming structure
Rename _main_controller_test.js to _main-controller_test.js
Rename _app_service_test.js to _app-service_test.js
Rename _app_service.js to _app-service.js
Rename _app_controller.js to _app-controller.js
Rename _app_controller_test.js to _app_controller-test.js
Rename _app_controller-test.js to _app-controller_test.js
Merge pull request #14 from hsubu/patch-1

Rename files to match naming conventions