Quick diff not updated on commit

[Piotr Piastucki]

Quick diff is not updated on commit.
Root cause:
1) BazaarResourceVariant extends CachedResourceVariant
2) the value returned by getCachedPath() correctly depends on resource's name and revision
3) BazaarStatusSubscriber uses last:1 instead of the actual revision number hence the cached content is used before and after the commit regardless of resource revision changes.

Fix:
1) Use the actual revision number in BazaarStatusSubscriber by calling StatusCacheManager.getResourceRevision()
2) Implement revision number caching in StatusCacheManager