Split up top-level .gitignore and .gitattributes

https://bugs.webkit.org/show_bug.cgi?id=82687

Patch by David Barr <davidbarr@chromium.org> on 2012-03-30
Reviewed by Tor Arne Vestbø.

.:

Jeff King <peff@peff.net> suggested this on the git mailing list.
http://article.gmane.org/gmane.comp.version-control.git/194294
He reported a 1.6 times speed up for 'git status'.

* .gitattributes:
* .gitignore:
* ManualTests/.gitattributes: Added.
* Source/.gitignore: Added.
* Websites/.gitattributes: Added.

PerformanceTests:

* .gitattributes: Added.

Source/JavaScriptCore:

* JavaScriptCore.gyp/.gitignore: Added.

Source/Platform:

* Platform.gyp/.gitignore: Added.

Source/ThirdParty:

* glu/.gitignore: Added.

Source/WebCore:

No new tests, source control administrivia.

* .gitattributes: Added.
* WebCore.gyp/.gitignore: Added.

Source/WebKit/chromium:

* .gitignore: Added.

Source/WTF:

* WTF.gyp/.gitignore: Added.

Tools:

* .gitattributes: Added.
* .gitignore: Added.
* DumpRenderTree/DumpRenderTree.gyp/.gitignore: Added.
* TestWebKitAPI/TestWebKitAPI.gyp/.gitignore: Added.

LayoutTests:

* .gitattributes: Added.
* .gitignore: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@112683 268f45cc-cd09-0410-ab3c-d52691b4dbfc