LevelDB qdb branch

Current version: 1.18

quasardb LevelDB branch with full Windows support. This is not an official LevelDB branch, but the branch we use in our product, quasardb.

• Full Windows support: everything builds, all tests pass;
• CMake based build
• Explicit (thread unsafe) de-allocation routines for "clean exits". Helps a lot when running your application into a leak detector;
• The Windows build requires Boost;
• Our code is C++11ish and may require a recent compiler;
• Lots of warnings fixed;
• Is not 100% compliant with Google coding style.

Tested on FreeBSD, Linux and Windows (32-bit & 64-bit).

Might contains trace of nuts.

Comments? Questions? Suggestions? Pull!