Prepare for 0.9 release

[mstevens83]

Please add blockers for 0.9.0 release below:

• [x] Extensions can register their version
• [x] deregister method (for testing purposes only)
• [x] Add & document core Info API (api/info/)
• [x] Audio file support
• [x] Value-based symbology mode for categories:
  • [x] Add optional symbol ImageField to LookupValue model
  • [x] Add optional symbol ImageField to MultipleLookupValue model
  • [x] Add admin pages support for viewing/changing/deteling (Multiple)LookupValue symbols (https://github.com/ExCiteS/software-dev/issues/76)
  • [ ] Add admin pages support for setting category display mode to be based on the symbol of a (Multiple)LookupField (possibly with a colour or category-wide symbol as fall-back)
• [x] Add possibility to lock projects
• [x] Write a blog post about 0.9 release
• [x] Up-to-date dependencies

[ghost]

Make draft blog post (GeoKey website) and add things you've done, I will add mine and publish when 0.9 is released.

Not sure if I manage to finish everything until you leave.

[mstevens83]

I saw you deleted the lookupvalue-symbology branch. Did you fully merge it into master?

[mstevens83]

Ok nevermind, I found it. I was not looking far enough back :-) https://github.com/ExCiteS/geokey/commit/8fbe08a5b91489b0e40e66a202ead596d08d1053

[ghost]

Yes, everything's on master now. I'll do a 0.9 release later today or tomorrow early morning.

[mstevens83]

Great!

[ghost]

Great job, thanks @mstevens83 :+1:

[mstevens83]

You too @juliusosokinas ;-)