move add identity logic out of Member.has_identity()
move SQL out of DummyMember constructor
create init_community() for community init logic
remove loading identity message in dispersy _store()
small changes
remove get_temporary_member_from_id() from dispersy.py
remove get_member(s)_from_id() from dispersy.py
make init_community() a classmethod
remove add_identity() from dispersy._store()
use init_community() in create_community()
add is Memeber check
minor fixes
update comments
small changes
update comments
Merge pull request #266 from LipuFei/factory-methods

change some factory methods