Merge pull request #3 from nlambson/master

custom refresh control support (non-UIRefreshControl)
Merge pull request #4 from nlambson/master

Expose more viewController viewDidAppear method for MLVCViewModel
Merge pull request #5 from nlambson/master

add block for completion of table view refresh
Adds a signal as a workaround for one of my apps

turns out that reactive cocoa rac_signalForSelector:@selector(viewDidAppear:)
doesnt play will with analytics providers libs that swizzle viewDidAppear:
Fix for tableviews not showing refreshcontrol
Fix for canvas on iPad.