fix some bugs

ingree -> ingres
stats information can display on webui

need to do:
fix flow management 's modification and deletion bugs (fields not total
match)
recover the flow table when switch connection fails unexpectedly
fix some bugs

Fix:
1 . ingree -> ingres

2. .Stats information can display on webui

Need to do:
1 . Fix flow management 's modification and deletion bugs (fields not
total match)
2 . Recover the flow table when switch connection fails unexpectedly
fix idletimeout hardtimeout
Merge pull request #33 from hsiehch/dev

Stat information can be displayed using POX adapter