Add typo3-flow-boilerplate package type

typo3-flow-boilerplate is part of my Google Summer of Code which adds Boilerplate packages to TYPO3 Flow.

http://cognifloyd.blogspot.com/2013/05/basic-designs-for-typo3boilerplate.html
http://cognifloyd.blogspot.com/2013/05/boilerplates-and-builders-in-typo3-neos.html