Windows port for LevelDB based on Boost libraries. See files README and WINDOWS for details.
Merge branch 'master' of https://code.google.com/p/leveldb into windows
A number of bugfixes:

- Added DB::CompactRange() method.

  Changed manual compaction code so it breaks up compactions of
  big ranges into smaller compactions.

  Changed the code that pushes the output of memtable compactions
  to higher levels to obey the grandparent constraint: i.e., we
  must never have a single file in level L that overlaps too
  much data in level L+1 (to avoid very expensive L-1 compactions).

  Added code to pretty-print internal keys.

- Fixed bug where we would not detect overlap with files in
  level-0 because we were incorrectly using binary search
  on an array of files with overlapping ranges.

  Added "leveldb.sstables" property that can be used to dump
  all of the sstables and ranges that make up the db state.

- Removing post_write_snapshot support.  Email to leveldb mailing
  list brought up no users, just confusion from one person about
  what it meant.

- Fixing static_cast char to unsigned on BIG_ENDIAN platforms.

  Fixes Issue 35 and Issue 36.

- Comment clarification to address leveldb Issue 37.

- Change license in posix_logger.h to match other files.

- A build problem where uint32 was used instead of uint32_t.

Sync with upstream @24408625
support mingw-gcc make
fix for non-windows make
fix .gitignore
minor fix env_windows.cc
add jni and fix *printf on mingw
minor fix
minor fixes
add mingw build script
fix DeleteDir
add linux build script
add support for latest snappy (1.1.1)
use BloomFilterPolicy for better reading profermance;
add build info;
add todo
add db backup for jni
add db iterator for jni
add license to env_windows.cc
add getting value of iterator and compacting db for jni
fix backup in jni