Nitpick spelling

TK is great. Thanks a lot.
Merge pull request #366 from srenatus/patch-1

Nitpick spelling
Use Ruby 2.1 instead of 2.1.0

Ruby is now following semver starting with 2.1, and patch versions will use 2.1.1 instead of appending 2.1.0-p1
Remove outdated matrix exclusion
Merge pull request #370 from justincampbell/ruby-2.1

Use Ruby 2.1 instead of 2.1.0 for CI
new subcommand exec
enable remote_command to run multiple instance
Fix test failure with minitest 5.3.0.
Remove old, unused gems that were used for guard in Gemfile.
Fix adapters -> profiles deprecation warning with simplecov.
Only run simplecov when the COVERAGE env var is set.
Tighly version pin style & complexity gem libraries.
Remove tailor gem from project.
Refactor Rakefile.
Align hash elements in Thor DSL methods.
Favor Hash#key? over Hash#has_key?.
Use hash rocket syntax in production code.
Eliminat unused assignments & fixed resulting logic.
Remove space between not operator and code (style).
Remove trailing commas in hashes (style).