+ Add indexd into Makefile.am and configure.ac
Merge branch 'log_manager' into index_manager
 + Start to write IndexManager
 * Added index_manager_test
 + Initialize AST
 + Parse op string for AST
Merge branch 'master' into ast
 + Added comments to AST nodes
 + Added ExprAst
 * More comments
Merge pull request #21 from vsfs/ast

Initial impl of AST
 * 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.
 + Master server create_index()
 - remove unimported configure
 * Rollback Makefile.am
 + Added IndexNamespaceInterface
 + Added PartitionManagerInterface
 + Added MockIndexNamespace and MockPartitionManager
 * Use MockIndexNamespace and MockPartitionManager to run MasterControllerTest
 * Fixed the initialize order of MasterController's fields
 + Added comments for PartitionManagerInterface