Fix for issue #212 - Groups not reloaded when user is switched

See merge request !19

Fix for issue #209 - Issue does not update when label is added

- Trigger update for labels if necessary after updating issues
- Trigger update for notes after issue is edited (Required if assignee is changed while editing the issue)
- Use `notifyItemRangeChanged` instead of `notfiyDatasetChanged` for updating notes

See merge request !18

Fixed overlap in issue overview



See merge request !17

- Trigger update for labels if necessary after updating issues

Added circular animation to the attachment selection menu

Added an CircularReveal dependency (https://github.com/ozodrukh/CircularReveal) for
compat reasons (native supports from API 21, and this supports from API 14). We could
use this lib in other parts of the system too, it's easy to use...

See merge request !16

Added an CircularReveal dependency (https://github.com/ozodrukh/CircularReveal) for
compat reasons (native supports from API 21, and this supports from API 14). We could
use this lib in other parts of the system too, it's easy to use...