project: adapt README snippets to new WeavyDemo

project: enhance README informations

project: add CocoaPods compliance

project: add CocoaPods compliance

warp: resume observing if displayed (#6)

A warp can be paused when a sub warp is launch. When we get back
on the initial Warp, the Rx subscription resumes

warp: a Warp must be triggered by a Stitch with a dedicated Weftable

This dedicated weftable drives the navigation at the whole Warp level.
It allows:
- to have some logic to define the first Weft, and so the first navigation action that will take place in the Warp
- to pop login screen at anytime for instance.

This is not needed anymore to have a dedicated weftable for root UINavigationController.
The warp's Weftable has replaced this behavior.

This commit also adds documentation.

warp: simplify warp concept (#2)

* warp: remove Pattern concept

Pattern concept is too close to Warp concept

* loom: simplify the PresentationStyle propagation

this commit allows to directly modify a stitch PresentationStyle in case
it comesfrom a previous stitch that redirects to a new Warp.

It simplifies the loom, in particularly the processing of the
BehaviourSubject<(Warp, Stitch)>

* presentationStyle: rename .none in .root

this commit:
- renames the .none entry into .root because it is more expressive
- make the .root entry the default value of a Stitch, if no init parameter is provided