Huge list of changes :)

1. https://github.com/LiveHelperChat/livehelperchat/issues/381
2. https://github.com/LiveHelperChat/livehelperchat/issues/362
3. Changed map link in chat window to be compatible with new google maps version
4. Referer page will open in a new window
5. End range for form's module will be included in combobox also
6. Pure SQL queries for performance improvement in a few places. Also implemented SQL transaction in a few places.
7. Then user naviagates to another page on site to operator will be shown user status with new page.
8. https://github.com/LiveHelperChat/livehelperchat/pull/380
9. https://github.com/LiveHelperChat/livehelperchat/pull/373
10. https://github.com/LiveHelperChat/livehelperchat/pull/379
11. https://github.com/LiveHelperChat/livehelperchat/issues/375
12. Fixed bug then same chat was transfred to department multiple times, but was not shown in list.
13. https://github.com/LiveHelperChat/livehelperchat/pull/373
14. Avoid showing widget URL instead of page url, then widget is opened.
15. Now most of generic chat's list are AngujarJS based.
16. Fixed bug then closing tab, tab was not removed from session and upon page refresh was still open.
17. Bugfix based on https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/livehelperchat/Zh3aKnJJOnM/cki8uSL1Y7EJ
18. https://github.com/LiveHelperChat/livehelperchat/issues/286 mod_security compatibility

execute doc/update_db/update_77.sql for update and follow standard upgrade tutorial.