[#1466] New tab - Presence start-end - and statistics for it
[#1466] Fixed pep8 errors
[#1466]Unnecessary tests editing. Presence_weekdday-fixed one bug
[#1466]Iproved API for start-end & JSON stuff
[#1466]Iproved API for start-end & JSON stuff
[#1466]Commit without tests file
[#1466]Formating
Merge pull request #3 from gruber86/bug_1466

Bug 1466
merge upstrem/master into bug_1431