This adds support for specifying v8Flags with dashes. Previously only underscores
were allowed.
Also allows specifying values for v8Flags in the from --flag=value, which was not supported till now.
Also add --inspect support.
I'm extremely stupid and didn't commit as I go. To anyone reading this
I'm extremely sorry. A lot of these changes are very broad and I plan on
releasing Babel 6.0.0 today live on stage at Ember Camp London so I'm
afraid I couldn't wait. If you're ever in London I'll buy you a beer
(or assorted beverage!) to make up for it, also I'll kiss your feet and
give you a back massage, maybe.
