solved #58, update API
removed 'Welcome Token' concept, obsoleted by #58 and by receiver username specifiation
fixed Cyclone behaviour: now both dict and list are JSON
Merge branch 'master' into serialize_lists

* master:
  fixed Cyclone behaviour: now both dict and list are JSON
  removed 'Welcome Token' concept, obsoleted by #58 and by receiver username specifiation
  solved #58, update API

Conflicts:
	globaleaks/handlers/base.py
Replace json_write with write