Add drover.properties for libyuv

To use this for reverts, just run drover
from the root directory (i.e. the directory
where this file is located). Notice you'll
end up with a drover_<revision> directory
being created that contains the revert changes.

If you don't have a checkout, you can also
use it like this:
svn export https://libyuv.googlecode.com/svn/trunk/drover.properties
Then just run:
drover --revert <revision>

TBR=fbarchard@google.com

Review URL: https://webrtc-codereview.appspot.com/40909004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1290 16f28f9a-4ce2-e073-06de-1de4eb20be90

drover.properties

+BASE_URL = "https://libyuv.googlecode.com/svn"
+TRUNK_URL = BASE_URL + "/trunk"
+BRANCH_URL = BASE_URL + "/branches/$branch"
+SKIP_CHECK_WORKING = True
+FILE_PATTERN = file_pattern_ =  r"[ ]+([MADUC])[ ]+/((?:trunk|branches/.*?)(.*)/(.*))"
+PROMPT_FOR_AUTHOR = False