0.2.4
Merge remote-tracking branch 'origin/master'

Conflicts:
	META-INF/plugin.xml
Move loading changelist to ReviewItem
#35 Support patch files

If a reviewItem is reported with patchUrl, download the patch and
construct a special PatchReviewItem, that creates CommittedChangeList
from the patch file.

Cache downloaded patch files, because they can be requested multiple
times (actually, for each file in the patch).
#35 Support comments for patches

ReviewItem path should be adjusted as well.