Introduce Core Component Generator

[marcoroth]

Introduce Core Component Generator

This PR introduces the matestack:core:component generator. This generator makes it a lot easier to scaffold new core components and therefore speeds up the development of them.

Example

The generator can be invoked with rails generate matestack:core:component NAME

This will generate the following files:

app/concepts/matestack/ui/core/NAME/NAME.haml
app/concepts/matestack/ui/core/NAME/NAME.rb
spec/usage/components/NAME_spec.rb
docs/components/NAME.md

Changes

• adds the matestack:core:component generator
• adds tests for it
• updates the tooling docs

Notes

This PR follows the same naming scheme for the generator names as #251.

[pascalwengerter]

Great work, @marcoroth! I am not quite sure yet whether I'm fine with shipping a core component generator with the gem (mostly because users could be confused and there is probably a limited set of core components, after all), but let's see what @jonasjabari thinks about it ;)

[marcoroth]

I agree. This generator only makes sense inside the matestack-ui-core codebase. Maybe we can limit this generator to only work/appear in here.

[jonasjabari]

@marcoroth greate work! just one thing (as @pascalwengerter already considered) please move the documentation to the contribution docs in oder not to confuse normal matestack users :)