refactor(minErr): better minification and other improvements

Removes a "magic number" (2) used multiple times in the code.
Removes unnecessary variables "arg" and "prefix".
Removed a condition within the "for" loop that generates query string parameters.
Adds a test case to ensure URL parameteres are generated as expected.
Merge branch 'refactor-minerr' of https://github.com/LeonardoBraga/angular.js into refactor-minerr

Conflicts:
	src/minErr.js
	test/minErrSpec.js