Make Git ignore in resources more fine-grained
Make Git ignore in resources more fine-grained

Just removing !*.sha1 in
https://webrtc-codereview.appspot.com/39929004
would have been too easy. This should do the job.

BUG=4267
TBR=andrew@webrtc.org
TESTED=Ran git status on a synced checkout, showed no untracked files.
touch resources/foo.sha1
Ran git status, showed the new file as untracked.

Review URL: https://webrtc-codereview.appspot.com/39039004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#8328}
git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@8328 4adac7df-926f-26a2-2b94-8c16560cd09d

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