LevelDB version 1.11.0.
Merge branch 'next' into leveldb_update

Conflicts:
	src/vault
Merge branch 'next' into leveldb_update

Conflicts:
	src/drive
Fix for MSVC x64 builds.
Moved leveldb tests to Commonn and set to build if MaidsafeTesting is true.
Added boost dependency fix.
Merge branch 'next' into leveldb_update
Merged leveldb_update.