Always use unix-style line endings in Generators.

This makes for consistent output across operating systems.  In particular, it makes Windows output unix-style.

http://gwt-code-reviews.appspot.com/776803/show
Review by: bobv,rjrjr


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8605 8db76d5a-ed1c-0410-87a9-c151d255dfc7