[fix bug 907250] Add django-cache-machine to jinja templates.
* PEP8 beautifications.
[fix bug 912500] Don't delete mentees' userprofiles on mentor deletion.
[fix bug 912916] Don't delete related bugs on user's delete.
Merge pull request #485 from akatsoulas/907250

[fix bug 907250] Add django-cache-machine to jinja templates.
Update leaflet.js from v0.3 to v0.6.4
Add leaflet-locatecontrol plugin
[Fix bug 904880] Use geolocation to zoom /events map to user location

* Fix setView and zoom without patching
* Fix identation and chained methods call
* Fix timeout on show message
* Fix geolocation onLoad