[upd] spm

updates

Merge branch 'master' of https://github.com/multimediasuite/SweetCurtain

Global updates

[fix] curtain update model leak

[update]

Added curtainWillEndDrag to delegate

Custom scroll view support added

[update] add relative coefficient and make controllers open

Merge branch 'master' of https://github.com/multimediasuite/SweetCurtain