add the storage interfaces for record io and invert record io.
enhance according to review result.
fix the codes according to review results
missing file.
add the storage interfaces for record io and invert record io.
enhance according to review result.
fix the codes according to review results
missing file.
fix the uint32 to int32 convesation
Merge branch 'master' of https://github.com/anqin/toft

Conflicts:
	storage/recordio/reverse_recordio.cc
Merge pull request #3 from anqin/master

Add interfaces of recordio & inverse recordio