[#1431] cherry pick
[#1431] cherry pick fix
Merge branch 'bug_1431' of github.com:gruber86/presence-analyzer-mroman into bug_1431
[#1431] Correct file
[#1466] New tab - Presence start-end - and statistics for it
[#1466] Fixed pep8 errors
[#1431] Improved tests and fixed pep8 errors
[#1466]Unnecessary tests editing. Presence_weekdday-fixed one bug
[#1431]Imporved tests
[#1431]Imporved tests
[#1466]Iproved API for start-end & JSON stuff
[#1466]Iproved API for start-end & JSON stuff
[#1466]Commit without tests file
[#1431]Removed unnecessary assertions
[#1466]Formating
Merge pull request #3 from gruber86/bug_1466

Bug 1466
merge upstrem/master into bug_1431
Merge pull request #2 from gruber86/bug_1431

Bug 1431