Switch to the new version of Zax Dashboard and update dependencies

2.1 Updates

• h2() hash function zero-pad prefix increased to 64 bytes to match sha256 block
• Double JSON encoding removed in file commands
• Default session timeout increased to 20 minutes
• Glow now supports command line interface:

glow clean <relay_url> <guest_public_key>                delete all files in mailbox on the relay
glow count <relay_url> <guest_public_key> [options]      show number of pending files on the relay
glow download <relay_url> <guest_public_key> [options]   download file(s) from the relay
glow key [options]                                       show public key or h2(pk), set/update private key
glow help [cmd]                                          display help for [cmd]

Numerous stability and performance updates to the core codebase, and introduced new functionality of extending the Zax “dead drop” style communications to include file exchange.

• Codebase upgraded to Ruby 2.4.1 and Rails 5.1.3
• New set of commands for device-to-device exchange of large files
• Dynamic throttling option: when on, the relay session handshake “proof of work” function will grow harder with increased server load
• Restart time window: optionally config time periods when supporting services are restarting, all workers will sleep during that window
• Improvements and optimizing for multi-worker/multi-threading access to Redis
• New logging details and easier to read color-coded logs
• Many performance improvements and bug fixes