New version of Coracle is out, let me know if see anything amiss!

- [x] Re-write data storage layer to conserve memory using a custom LRU cache

- [x] Fix bugs with handling invalid keys

- [x] Improve pubkey/anonymous login

- [x] Generate placeholder profile images (@morkowski)

- [x] Fix notifications to more complete and reliable

- [x] Update license back to MIT. Enjoy!