normalize file paths to avoid conflicts in Windows
normalize file paths to avoid conflicts in Windows

Without normalize, the capitalization of the drive letter is not well defined in Node 0.11+.

Ideally this should be handled in `vinyl` or `vinyl-fs` (base libraries for gulp's file object), but for now this is a harmless fix.
samouss/gulp-angular-templatecache,RobertoUa/gulp-angular-templatecache,AOEpeople/gulp-angular-templatecache,eanakashima/gulp-angular-templatecache,stevemao/gulp-angular-templatecache,Agnitio/gulp-agnitio-templatecache,miickel/gulp-angular-templatecache