* compilable version.
Merge branch 'master' of github.com:vsfs/vsfs into index_controller
Merge branch 'master' into index_controller
* imported indexd.cpp
* changed uint64_t to int64_t in index manager
* modified according to code review.
* extracted CheckStatus to ThriftUtil
* fixed a compile bug.
* updated according to code review.
*updated vobla
* deleted unused def in leveldb_store
Merge pull request #37 from vsfs/index_controller

Add Index controller and Indexd