Why:
* The old way of handling arguments could make it
difficult to make non-breaking changes because
to be able to handle more arguments than the
'--above' argument, the logic would need to be heavily
refactored and demand restrictions on argument order.
This change addresses the need by:
* Parse arguments in a cleaner way
* Make the command more future proof with respect to arguments
Notable change is the synopsis. Please the see man page.
Although Github reserves the 'visionmedia' user space(a visit to there
will be redirected to 'tj'), it's better to
rename the links from visionmedia/git-extras to tj/git-extras
