grunt 2015 branch - known issue - bootstrap css not copied through correctly by custom partial minification

[PrimeLens]

There was a need for compiled code to retain original variable names and not be rearranged, yet excess comments, spaces, table and newlines needed to be removed.
This resulted in a custom function in the grunt file that achieves this partial minification.

A know bug is that some of the regex in that function trips up with bootstrap.css and bootstrap.min.css