Cleanup:
* Remove is_bit_set and use regular bitwise operations instead.
* Remove the function-like macro "nothing".
Ledger load and ledger replay fixes:
 * Stash the loaded ledger where consensus can find it.
 * When loading a ledger for startup, try the backend too
 * Apply replay transactions to a mutable snapshot
Fix state check in PeerImp::recvHello
Process switches with regex in VSProject generator:
* Handles "DisableSpecificWarnings" switches
Tidy up rpc module:
* Move directory up to ripple/module/rpc
* Use C++11 idioms and best practices
Better types and more comments in RippleCalc.

* Better automatic conversions to and from tagged uint160 varints.
* Start using tagged variants of uint160 for Currency, Account.
* Comments from 2014/6/11 RippleCalc session.
Add missing beast includes
Refactor Overlay for Structured Network support:
* Move overlay up one directory
* Add abstract_protocol_handler, message_stream
* Add peer_protocol_detector
* Tidy up some declarations
* Use strand::running_in_this_thread instead of bool
* Update README.md
* Replace protocol message read loop:
  - Process data in arbitrary size chunks
  - message_stream extracts individual messages
  - peer_protocol_detector identifies the handshake
  - abstract_protocol_handler used for dispatching messages
* Remove unused protocol message types:
  - mtACCOUNT
  - mtCONTACT
  - mtERROR
  - mtGET_ACCOUNT
  - mtGET_CONTACTS
  - mtGET_VALIDATIONS
  - mtSEARCH_TRANSACTION
  - mtUNUSED_FIELD

Conflicts:
	src/ripple/module/app/main/Application.cpp
	src/ripple/module/app/misc/NetworkOPs.cpp
	src/ripple/module/app/peers/PeerSet.cpp
Add protocol detector logic
Add RIPPLE_SINGLE_IO_SERVICE_THREAD setting
[WIP] borked message parsing