Merge pull request #92 from doabit/master

Add custom spring command
Bump to 2.1.0
Reload GH releases after publishing the latest one
Fix spring paths
Merge pull request #93 from doabit/fix_spring_relative_paths

Fix spring paths
Don't need to require guard-minitest version's here
Bump to 2.1.1
When use Spring `rake test` command, shouldm't run old_runner.rb, either use Minitest 5 or 4