+ Add indexd into Makefile.am and configure.ac
Merge branch 'log_manager' into index_manager
 + Start to write IndexManager
 * Added index_manager_test
 * Change transaction id to int64_t
Merge branch 'master' into index_manager

Conflicts:
	vsfs/Makefile.am
 * Fixed the indent
Merge pull request #22 from vsfs/index_manager

Migrated index manager.