Restrict the amount of css rules per file

[3rd-Eden]

Internet Explorer =< 9 have an css rules of 4095 per file. When we add a new file or concatenate different file instances in to one file we should take this limit in consideration as it might make more sense to serve 2 files instead 1 in these cases.

Source: http://blogs.msdn.com/b/ieinternals/archive/2011/05/14/internet-explorer-stylesheet-rule-selector-import-sheet-limit-maximum.aspx