Re-enable 'crlf' attributes on *.cs

Re-enable 'crlf' attributes on *.cs

This fixes EOL conversions flagged by git 1.7.1 core.autocrlf=true.  At this
point, neither git 1.7.1 nor 1.7.2 show any automatic CRLF normalization.
I think we're ready for another experiment.

There seems to be a difference in the handling of mixed line-ending files
between git 1.7.2 and older versions, when core.autocrlf is set to true.