HTTP support improvements:
* RFC2616 compliance
* Case insensitive equality, inequality operators for strings
* Improvements to http::parser
* Tidy up HTTP method enumeration
HTTP handshake in peer protocol (RIPD-351):
* New I/O paths for client and server role
* New handshake_analyzer detects the peer protocol
* New basic_message class for parsing and storing HTTP messages
* Conditional compilation for selective feature enabling.
* Server supports both current handshake and HTTP handshake
Add owner_funds to client subscription data (RIPD-377)

Conflicts:
	src/ripple/module/app/ledger/AcceptedLedger.cpp
Rewrite STObject::setType for improved performance
Avoid a mutex 99+% of the time in SField::getField
Set version to 0.26.2-alpha-1