initial commit with readme
copied in block gateway from python_blocks
copied in new blocks from next branch
copied in boilerplate build system (from howto)
gr blocks now compiling (c++) only
gr blocks python and swig
added gr blocks grc files
added extras prefix for grc block names
added family of blob passing blocks
added python blocks
copied in digital pkt2 blob framer/deframer
added pmt msg passing version of uhd async msg source
copied over decim fir from gr-filter
removed old stuff copied from tree
docs and feature detection
keep python blocks api consistent, inject into gr
support for being in a subtree
stream selector can always compile now (hier2 virtual)
added to readme
include prefs for local includes