New _sessionget() method. get_token() refactored to use it.
get_stream() and get_notifications() refactored to use _sessionget()
get_user_info() refactored to use _sessionget()
get_mentions() refactored to use _sessionget()
get_tag() refactored to use _sessionget()
Two tests added
testconf.py added to .gitingore
get_mailbox() refactored to use _sessionget()
Removed unnecessary data obtaining from `get_*` methods
get_*() methods refactored to use _sessionget()
Small changes in test suite, preparation to refactor to _sessionpost()
Small fix in manual
Code cleanup (flake8)
Merge branch 'master' into session-refactoring

Conflicts:
	diaspy/client.py
	diaspy/conversations.py
	diaspy/models.py
	tests.py
Methods refactored to use _sessionpost(), tox.ini file added
Merge pull request #9 from marekjm/session-refactoring

`diaspy/` modules refactored to use `_sessionpost()` method