Add Podspec, Travis integration, test project

@Raizlabs/maintainers-ios 
This will complete the transition to CocoaPods.

### Changes
- Deprecated several components (available only in archive now)
   - UITableViewCell styling category (in favor of collection views for complex styling)
   - RZKeychain (in favor of SSKeychain)
   - RZLoadingImageView (in favor of SDWebImage)
   - RZHud (in favor of better UX design practices)
- Added Travis CI
- Added podspec/subspecs for each thing
- Updated README

### TODO
- [ ] Tag 2.0.0 release
- [ ] Push podspec