Minor fix in usage docs for mapping directory for Dockerfile
Fix uploading spks for tests
Fix clearPackages to also delete grains
Output sandstorm.log on failed tests
Fix Dockerfile.dev for changes in meteor causing problems with docker
Fix error about Npm not being defined on client side
Clean up testing

* Switch to using firefox in selenium
* Add script `run-tests.sh` that will pre-download assets such as spks
* Fix tests to work in firefox
* Upgrade versions of dependencies