Convert deps collections to arrays first
Split out Boost.Python
boost-python: drop build option pass-through to boost
boost-python: syntax
boost-python: trim some fat
boost: put user-paths back

I thought this was a bad Python hack but git blame told me that it helps
build MPI, from 937d81bdd23d6df29e337.
boost-python: add test
address feedback
infer boost-python c++11 option from boost's tab
Use boost-python instead of boost => with-python

Boost.Python support in Homebrew is moving from the boost formula to a
new boost-python formula. This commit updates formulas that were using
boost --with-python to use boost-python instead.
boost: update 1.55.0_2 bottle.
boost-python: add 1.55.0 bottle.
ledger: update 3.0.3 bottle.
libpst: update 0.6.55 bottle.
libtorrent-rasterbar: update 1.0.1_1 bottle.
mapnik: update 2.2.0_2 bottle.
pyexiv2: add 0.3.2 bottle.