ENYO-2992: test if the style attribute is needed
Add Palette/Inspector design rules

This rules have to be applied to widgets given by Enyo or librabries in order to propose them inside the designer
fix some type in Palette/Inspector design section
define "ignore" rules for hiding components into the palette
typos
Update CONTRIBUTE.md
ENYO-3451: commented-out porject switch as suggested in JIRA
change ignore palette items process
Merge pull request #628 from enyojs/ENYO-2992

ENYO-2992: test if the style attribute is needed
Merge pull request #629 from enyojs/ENYO-3451

ENYO-3451: commented-out project switch as suggested in JIRA