Use karma convention for parsing client arguments

[maksimr]

karma pass args how array of arguments.
I think will be cool use this convention and in grunt-karma
or implement parsing arguments inside karma
otherwise it may lead to strange bugs:

Bug:
maksimr/karma-mocha-debug#1
Deferred bug in karma-mocha:
https://github.com/karma-runner/karma-mocha/blob/master/src/adapter.js#L84

Related issues:
karma-runner/karma-mocha#25
karma-runner/karma#927