update fetch_stealth for latest changes to libbitcoin.
updated for changes to stealth_prefix type (now a boost::dynamic_bitset)
Merge pull request #5 from veox/fix-libbitcoin-f7ac085-regression

Fix libbitcoin f7ac085 regression
subscribe by prefix instead of by address now.
merged eric's VC files.
Merge branch 'develop' into dev2

Conflicts:
	src/client/interface/client_blockchain.cpp
	src/worker/service/blockchain.cpp
rename obworker to obelisk-server
init.d (file moves): obbalancer no longer present, obworker renamed to obelisk-server.
init.d + setup.sh (file edits): obbalancer no longer present, obworker renamed to obelisk-server.