Sandstone

Changelog:
* Improved readability of terminal
* Added file modification events
* Added notification to editor when open document changes on disk
* Bugfixes
* Removed keyboard shortcut for document saves. See SandstoneHPC/sandstonehpc-project98 for details.

A full list of changes can be found in PR 112.

Summary:
* Updated ui-bootstrap to v2.5.x
* Editor service now uses promises
* File downloads
* Editor filetree saves state between nav events

Full changelist in PR 107

Bugfixes:
* https://github.com/SandstoneHPC/sandstonehpc-project/issues/66
* https://github.com/SandstoneHPC/sandstonehpc-project/issues/64

Changelog:
* Brand new filesystem API 🎉
* Refactored Filebrowser for new API
* Login and Logout handlers are now configurable
* Support for URL prefixes
* Web terminal environment and start command now configurable
* Added alert system for client
* _...and much more!_

Release summary:
- Added a user-accessible logout link.

Release summary:
- Filesystem optimizations
- API bugfixes
- Travis integration