style(bitswap) rename variable to 'routing'
style(bitswap) rename Adapter -> BitSwapNetwork for clarity
rename var
refactor(bitswap/network) rename -> BitSwapNetwork

remove 'adapter' concept
instead, describe the component as the bitswap network

it's still an adapter, but it's just not necessary to describe it as
such
refactor(core, bitswap) split bitswap init into two steps

@jbenet
refctor(bitswap/network) replace Network interface with Dialer interface
Merge branch 'refactor/bitswap-initialization' into maybebtc-november