Dependencies referenced via ssh break npm install

[larrysalibra]

Two dependencies are referenced via ssh which breaks npm install of apps that use this package for people that don't have github accounts and a valid ssh key set up.

Dependencies should be referenced via https

[cornelius-illi]

Still fails: 10161 error Command failed: git clone --template=/Users/x/.npm/_git-remotes/_templates --mirror ssh://git@github.com/shea256/bitcoinjs-lib.git

Although the repository is already listed with the https links explicitly in the package.json, the ssh-url shows up when installing

[larrysalibra]

The solution to this is probably to bump the version of blockstack-keychains to 0.0.8 - that's how we fixed it on the Portal: stacks-archive/blockstack-browser#215