Added a sentence to the description

The description section was lacking a definitive 
"what is vert.x" statement.
Clean up edits

I removed one paragraph from the background. 
I moved several paragraphs from the Initial Contribution section
to the Legal Issues section.
I changed the licensing terms to be definitive ALv2+EPL (as discussed)
I updated the dates.
I'm still not satisfied with the scope.
Merge pull request #4 from waynebeaton/master

Added a sentence to the description