Upgrade organic groups to 7.x-2.7
Update resources submodule
Update resources submodule
Update walkhub submodule
Update resources submodule
Update resources submodule
feature/490: css for call-to-action buttons

.cta class can be used everywhere in the site's content on <a> tags to make call-to-action buttons.
Update walkhub client submodule
feature/477: Creating Walkthrough default widget

* adding new library: reveal.js - recompiled in order to work fullscrren as we need it
* adding gulpfile for compiling sass files
* modifing iframe template to use the new library
* modifing walkthrough_slideshow module, to load slideshows when there are no screenshots
* adding new iconfonts (extending the existing ones, generated with icomoon webapp)
feature/447: default widget fixes.

Fixing errors from previous commit.
feature/477: default walkthrough widget.

fixing errors from previous commits.
Export collections and og settings to the collections feature.
Revert collection feature during the site udpate.
Delete old collection contents and content types.
Add a new view to list collection's items in the collection page.
Set the collection list block's place.
Export mani menu item for collections.
Revert global feature too because of the collection menu item.
Add pages and title field to collection block.
Reset navigation links.