Fix typo.
The commit is marked and displayed in the center.
Enable to display the commit older than 650th commit.
Add search box for the commit.
Fix bug when it has been switched to tag.
Sort the commits on network graph by commiter date.

Author date is not updated, if the commits is rebased.
So the network graph having many rebased commit turns round and round,
that it is very difficult to undarstand history.
Merge branch 'easy-to-find-commit-on-network-graph' of https://github.com/hiroponz/gitlabhq into hiroponz-easy-to-find-commit-on-network-graph
style network graph form a bit
Merge branch 'hiroponz-easy-to-find-commit-on-network-graph'