Update .gitignore.

Ignore vpc_crc and filters extensions.
Merge remote-tracking branch 'upstream/master'
Replacing CR/LFs with LFs in xcode_ccache_wrapper.

Fixed

error: can't exec
'/Users/ardneran/Documents/Projects/GitHub/source-sdk-2013/*p/src/devtoo
ls/bin/osx32/xcode_ccache_wrapper' (No such file or directory)
Command
/Users/ardneran/Documents/Projects/GitHub/source-sdk-2013/*p/src/devtool
s/bin/osx32/xcode_ccache_wrapper failed with exit code 71

http://www.linuxquestions.org/questions/linux-general-1/bad-interpreter-
no-such-file-or-directory-213617/#post1975207
perl -i -pe's/\r$//;' <file name here>
Added xcode_ccache_wrapper as text to .gitattributes.

This will hopefully prevent file turning into CRLF when someone next
touches it.
Update .gitignore.

Added a few extensions and ignore paths.
Merge remote-tracking branch 'upstream/master'
Added DS_Store to .gitignore.
Merge remote-tracking branch 'upstream/master'

Reverted .gitattributes xcode_ccache_wrapper change. Fixed line endings
for .gitignore and .gitattributes.
Merge pull request #182 from ardneran/master

Update .gitignore.