[BREAK] Remove cache layer and internal calculated property `room.usernames`

Merge master into develop & Set version to 0.67.0-develop

Release 0.66.3

* improved callbacks promises run

* fixed default fname

Merge master into develop & Set version to 0.67.0-develop

# Conflicts:
#	.docker/Dockerfile.rhel
#	.sandstorm/sandstorm-pkgdef.capnp
#	.travis/snap.sh
#	package.json
#	packages/rocketchat-lib/rocketchat.info

Release 0.66.2

This pull request aims to format the SVG file containing the UI icons.

- [x] Fix indentation
- [x] Sort icons alphabetically by `id`
- [x] Recover icons lost in c1a5d578

* Fix icons in channels message popup

* Fix descriptions in slash commands message popup

* Add scrolling in message popup

@RocketChat/core 

Closes #9990

This pull request properly brings the web app manifest up-to-date to the current specification and resolves the incorrect start_url origin and the path to the broken images as seen in this screenshot.

This resolves the unwanted and incorrect behavior experienced in both Google Chrome and Mozilla Firefox for Android.

![image](https://user-images.githubusercontent.com/643503/36929663-052fe33c-1e49-11e8-8a68-3d8e666d30e8.png)

Merge master into develop & Set version to 0.67.0-develop

# Conflicts:
#	.docker/Dockerfile.rhel
#	.sandstorm/sandstorm-pkgdef.capnp
#	.travis/snap.sh
#	package.json
#	packages/rocketchat-lib/rocketchat.info

Release 0.66.1