Redturtle.gallery

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- Added description in modal view [nzambello]

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- Fixed collective-slick import [pnicolli]
- Pinned collective-slick >= 0.2.0 [pnicolli]

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- Removed internal slick library code and added collective.slick dependency [pnicolli]

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- Republish 2.x version, because 2.0.0 somehow had a missing commit [pnicolli]

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- [Breaking change] removed js patterns: modal made in vanilla js and imported slick manually [nzambello]

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- Fix in template objects [nzambello]
- Fix js event handling [nzambello]
- Gallery view: added support for collections of images [nzambello]