Remove accidentally-added accounts-password.
Merge branch 'master' of github.com:kentonv/sandstorm
Transfer copyright from Kenton to Sandstorm Development Group, Inc. (Kenton's company).

Change BSD-licensed pieces to MIT license. This is legally equivalent, but less ambiguous, as BSD has at least three different common forms but MIT has only one.
Add basic working version of backup/restore
Add fs-extra package
Add GrainInfo struct to grain.capnp and persist it through backup.

Backup also includes log now, although it isn't used in restore.
GrainInfo is encoded and is named metadata in the archive. The sandbox's
data now all goes into a folder called data.
Change restore to be a global function. Also add icon for download
Various fixups to backup/restore
Add recent build files to .gitignore
Make grain's title be the filename when backing up
Fix up error reporting for restore and fix a bug with type of appVersion
Replace usage of single quotes