Fix import statement (#13)

* Fix import statement

* Update gemfile.lock

Add doc links to gemspec (#11)

* Add doc links to gemspec

* Update gemfile lock

Documentation improvements (#10)

* Update directory names

* Rename tests

* Exclude specs from coverage

* remove DS_Store files

* Improve documentation, add debug script

* Filter assets from codecov

* update readme

* Update tests

* Fix scale