Make images work with patches created using svn 1.7

Make images work with patches created using svn 1.7
<http://webkit.org/b/136507>

Reviewed by Darin Adler.

* PrettyPatch/PrettyPatch.rb:
(PrettyPatch.prettify): Delete redundant patches that claim
newly added images are actually removed.
(PrettyPatch.SVN_BINARY_FILE_MARKER_FORMAT): Rename from
BINARY_FILE_MARKER_FORMAT.
(PrettyPatch.SVN_IMAGE_FILE_MARKER_FORMAT): Rename from
IMAGE_FILE_MARKER_FORMAT.
(PrettyPatch.SVN_PROPERTY_CHANGES_FORMAT): Add. Used to find
and ignore property changes in svn 1.7 patches.
(PrettyPatch.SVN_START_OF_BINARY_DATA_FORMAT): Rename from
START_OF_BINARY_DATA_FORMAT.
(FileDiff.filename): Add read-only accessor.
(FileDiff.image): Add read-only accessor.
(FileDiff.image_url): Add read-only accessor.
(FileDiff.initialize): Add special case for svn-1.7 image
patches that add a file.  Update various regex constants per
above.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@173253 268f45cc-cd09-0410-ab3c-d52691b4dbfc