New extension, bug_1814. Presence_start_end added.
Merge branch 'master' of https://github.com/stxnext-kindergarten/presence-analyzer-jjanuzik into bug_1814

Conflicts:
	src/presence_analyzer/tests.py
deleting .pyc files
Updating code style
Another changes to the style, again
Final changes to the style
Merge pull request #3 from jakubjanuzik/bug_1814

[1814] New extension. Presence_start_end added.