Add "!" to piwik.js to prevent compressor to remove the copyright comment, also add current piwik version number #3677

We using a javascript compressor to minify and combine all javascripts to one file. The compressor remove all multiline comments, but not the ones which are starting with "/*!". Please add a "!"-sign to piwik.js, so your copyright will be still there and we can better check for the current version number. And also add the current version number to the js file. Thx.

See jquery javascript files...
http://code.jquery.com/jquery-1.9.0.min.js

We've gone back and forth on this. The current style reflects security "best practices" to minimize info disclosure that would allow identification of the Piwik version in use.