Use .ruby-version and .ruby-gemset
Update CI settings
Update test helper

Follow new semantics using test_helper instead of
minitest_helper. Split out minitest and simplecov
requires so they can be used independently in a
project if needed. Remove Simplecov configuration
from the test_helper to enable better config 
overrides. Default require of thincloud/test will 
use both simplecov and minitest (existing projects 
don't need to change).

* minitest_helper -> test_helper
* Provide minitest and simplecov separately 
* Update thincloud/test
Update Guardfile

* Remove rails bits
* Watch new test_helper
Don't need `File.join`
Update gems
Update rake tasks

* Add Rakefile that requires our tasks
* Add Cane task
* Update default to run test and cane
Update generator
Update README
Update paths in README
Merge pull request #28 from elskwid/updates

Updates to Minitest 5.0 and more