Merge pull request #2 from dkorolev/after_clang_format

Bringing master up to date.
Out-of-the-box build.

Still requires running tests as `LD_LIBRARY_PATH=./leveldb ./test/cpp/build/run_all_tests`.
README with build instructions.
More build instructions.
Made LevelDb static and made tests pass.
Added libsnappy-dev to deps. One-click build & test now.
Added 'make indent'.
Removed one clang-format parameter.

Due to versions incompatibility.

Dima: Ubuntu clang-format version 3.5.0-svn213415-1~exp1 (trunk) (based on LLVM 3.5.0)
AWS:  Ubuntu clang-format version 3.5-1ubuntu1 (trunk) (based on LLVM 3.5)
clang-format-3.5 more compatibility issues.
Fixed the flaky test.
Handle "checked" and "unchecked" data
Merge updates
Merge remote-tracking branch 'origin' into work_in_progress