Add DTFile and performance test for DTFile
Merge pull request #1030 from siyuanh/hds

Add DTFile and performance test for DTFile
SPOI-3016 #comment Add documents and DTFile wrapper for HDSFileAccess
API
Merge pull request #1031 from siyuanh/hds

SPOI-3016 #comment Add documents and DTFile wrapper for HDSFileAccess
Merge branch 'hds' of github.com:DataTorrent/Malhar into hds
Check committed window id for data files and do not attempt recovery
if checkpointed window id is less than committed windowid.