Switch to HOME environment variable instead of ~ for populating default home_path
Merge pull request #92 from evertrue/eherot/use-home-instead-of-tilde

Switch to HOME environment variable instead of ~ for populating default home_path
bump faraday / ridley gem requirements
version bump 1.2.0.rc1
remove guard-yard, it's broke
bump celluloid version and lock http to safe version
lock test dependencies
switch from Solve to Semverse
lock to stable version of ridley
bump archive gem lock
loosen constraint on thor
reformat gemspec
GitLab public repository support

This allows berks-api to scan GitLab repositories and index
them if they public.

It requires the :uri downloader in berkshelf v3.0.0beta8 or newer.

Closes #84