Add Makefile

Simplify install and test building steps.
Use Component(1) for development
Use 'suit-test' for Arrange's test

* More granular tests.
* Add more complete tests for equal-width and gutter-separated cells and
  their combination.
Fix combo of 'equal' & 'withGutter' modifiers

Fix gh-4
Remove the 'withGutter' modifier

Fix gh-3
Add gutter instructions to README
Update CHANGELOG
v0.2.0