Handle the dependencies in README

* add command dependencies to the commands themselves
* add dev dependencies to the README
Display stats for each commit in 'checkrepo'
[checkrepo] Richer commits overview
Bugfix for remote branch in checkrepo script

Before the script worked for remotes with the following setup:
remotes/origin/HEAD   -> origin/master
remotes/origin/master

Now it works also for remote with only (no HEAD):
remotes/origin/master
Merge pull request #3 from @ikusalic

"Update command descritions + Display stats in checkrepo"
Restore fast reviewing for single-screen commits