* ignores the first lines of a file with the license header

Update sinon to 1.15.4.
Update karma-jasmine to 0.3.0
Update jasmine to 2.3.4

This brings a bunch of new useful functions for unit testing.

Ref https://github.com/owncloud/core/pull/16724#discussion_r33236344 – shouldn't hurt also.

properly break after the first comment ends + allow to pass in one file/folder via commandline argument