Merge pull request #2359 from ten24/feature-bs3-collections-accordion

Feature bs3 collections accordion
adding propertydisplay and columnitem
pushing current work up
Merge branch 'feature-bs3-collections' of https://github.com/ten24/Slatwall into feature-bs3-collections
fixing bug with sibling items
changing icon to a times icon
Fixed issue with createpromotion
Merge branch 'feature-bs3-collections' of https://github.com/ten24/Slatwall.git into feature-bs3-collections-accordion
Fixed create dropdowns