Added a calendar that displays appointments (WIP)

[ghost]

Fixes #760

Changes proposed in this pull request:

• Bring in ember-fullcalendar;
• Display appointments in a new route within the calendar;
• Allow the user to get to an appointment's edit page via the calendar.

cc @HospitalRun/core-maintainers

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This is still WIP. Stuff that still needs to be done:

1. Automated tests.
2. Extra query params to store the calendar's current settings (date and view type) when navigating to an appointment and back.
3. This comment in the calendar route: // To cater for times like 0:00 - investigate.
4. Write our own header to style the calendar controls so they look more like the rest of HR;
5. The pinned 3.1.1 jQuery dependency was an initial workaround to get things running - have to check that out again;
6. Anything else that comes up here.

Things that I don't like very much include the redundant first query for the model the calendar route performs. The idea there is a bit backwards, so I'm not sure how to avoid it. The model to load is indicated by the calendar control, but you need a loaded route to get the calendar control, so you always have two loads. When returning from an appointment, it will do the first redundant load, then reset the calendar to the passed in view config, then reload.

Throw all your critique my way 👍

[ghost]

As this progresses I'll try to get a live view of my branch going on some server somewhere. It's a fairly large addition and I feel screenshots/videos/gifs aren't that helpful for seeing how it works.

[jkleinsc]

@BogdanAlexandru thanks for the update!

[jkleinsc]

@BogdanAlexandru I need to move this feature along. If you aren't working on it, I'd like to take what you have and continue working on it myself.

[ghost]

I'm unable to work right now and won't be for the near future, taking over sounds like the way to go. The calendar-view branch has all of my latest changes, nothing on local needs pushing.

Sorry for the late notice on this.

[jkleinsc]

Merging existing PR into calendar branch so I can continue the work that @BogdanAlexandru started. Thanks @BogdanAlexandru for your efforts!