cleanup .gitignore

This package does not have js output
IDE-specific exclusions should be done on the users machine

Author: kevmoo

.gitignore

@@ -3,15 +3,5 @@ build/
 packages/
 .pub/
 
-# Or the files created by dart2js.
-*.dart.js
-*.dart.precompiled.js
-*.js_
-*.js.deps
-*.js.map
-
-# IDE
-.idea/
-
 # Include when developing application packages.
 pubspec.lock