Refactore-expansion-panel

[jecisc]

In this PR I refactore some part of the expansion panel:

• Now the Expansion panel does not allow to update the icon and title/description with the ajax strategy but it is possible to do it easily with the brushes and some vanilla JS
• The ajax strategy only update the content now and not all the component
• Add some animations to fold/unfold
• The default icon now uses rotation (this is not enabled with custom icons)
• The brush expansion panel can now use the #toggleExpansionOnClick to fold and unfold
• Simplify the JS

Fixes #269 Fixes #280

[coveralls]

Pull Request Test Coverage Report for Build 590

• 16 of 54 (29.63%) changed or added relevant lines in 6 files are covered.
• 7 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.03%) to 65.96%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/Material-Design-Lite-Widgets/MDLHideExpansionStrategy.class.st	0	5	0.0%
src/Material-Design-Lite-Widgets/MDLLazyExpansionStrategy.class.st	0	8	0.0%
src/Material-Design-Lite-Widgets/MDLAjaxExpansionStrategy.class.st	0	9	0.0%
src/Material-Design-Lite-Widgets/MDLExpansionPanel.class.st	3	19	15.79%
<!--	Total:	16	54	29.63%	-->

Files with Coverage Reduction	New Missed Lines	%
src/Material-Design-Lite-Widgets/MDLLazyExpansionStrategy.class.st	1	23.53%
src/Material-Design-Lite-Widgets/MDLAjaxExpansionStrategy.class.st	2	0.0%
src/Material-Design-Lite-Widgets/MDLExpansionPanel.class.st	4	54.44%
<!--	Total:	7		-->

Totals
Change from base Build 587:	0.03%
Covered Lines:	3298
Relevant Lines:	5000

---

💛 - Coveralls

[jecisc]

Here is the example of the brush demo:

Here is the example of the widget demo

[juliendelplanque]

Maybe the rotation speed for the animation should be a little faster?

[jecisc]

I updated animations from 0.5sec to 0.3sec.