created parties screen

- removed SHMViewController
- added new screen to storyboard
- added labels
added "new party" button

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added tab bar controller

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removed storyboard

- added xib files for all view controllers

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added files to .gitignore
created custom collection view cells for party view controller

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configured party and button collection view cells

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added collection view to parties screen

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presenting custom tab bar controller from party cell tap

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