PullRequest: Fix incorrect rendering of changes.

Commit ids for the diff was incorect.
Merge pull request #138 from npcode/yobi refs/heads/fix/pull-request-incorrect-diff
remove cancel button from pullRequest view
fix wrong pullRequest.event.messages in korean
PullRequest: Fix IllegalStateException caused by be9a83.

Remove unnecessary @defining clause which causes the exception because
of calling PullRequest.getDiff.
PullRequest: Fix incorrect rendering of changes.

The fix of be9a838 was incorrect. PullRequest's diff should compare
merged commit and its parent, not its left parent and right parent.
Copyright: change copyright message
Merge pull request #141 from npcode/yobi refs/heads/fix/pull-request-incorrect-diff-2
exchange feeback link from yobi to github at global navigation
show correct notfound-errorpage
modify copyright at footer
modify feedback of messages.ko
conf: Set applyEvolutions.default to true.

This fixes the evolution error which occurs when start the application
in production mode.

The value was set to false at f08b546 to prevent losing of your
database, but it is not needed anymore because currently database
is stored as a file not into memory.