Remove useless imports from netzob.all file and add release file.

Change-Id: Ie7dda391b1529a08b3cb5308a91d315f3bdaa96f
Netzob Interactive Session Controller (IssueId #444).

Option '-i' starts a python interactive interpretor presets with imports
declared in netzob.all.py.

Change-Id: Ia84b7438c3cb0902825bad88fb5f40771719e560