[webkit-dev] Rename LayoutTests

[Ryosuke Niwa]

Hi,

Continuing the tradition of a massive rename in
https://lists.webkit.org/pipermail/webkit-dev/2012-August/021746.html,
I suggest we rename the top-level LayoutTests directory to something
more descriptive of the current state.

Some ideas:
IntegrationTests - Represents what they are for WebCore.
AutomatedTests - As opposed to ManualTests.
ContentTests - Not great for tab completion.
WebTests - Probably a bad idea for tab completion.

- R. Niwa