Add Gitter "office hours" to our contact info. (closes #197)

[skip ci]
Merge pull request #198 from inkling/jeff/gitter_office_hours

Add Gitter "office hours" to our contact info. (closes #197)
Clarify timezone of Gitter hours on README
Merge pull request #199 from MaxGabriel/patch-4

Clarify timezone of Gitter hours on README
Fix handling of TextViews within TableViews
Add a test case for the text field within a table view
Add support for checking existence of labels
Allow Class objects to be passed as selectors, as they implement id<NSCopying> also
Further pad the "terminal evaluation delay" for Travis' latest VMs.
Merge pull request #205 from inkling/jeff/increase_evaluation_timeout

Further pad the "terminal evaluation delay" for Travis' latest VMs.
Merge pull request #204 from justinseanmartin/jmartin/allow-passing-class-objects-to-selectors

Allow Class objects to be passed to selectors
Merge pull request #202 from justinseanmartin/jmartin/fix-scrollview-within-tableviewcell

Fix UITextView accessibility path when contained within a UITableViewCell
Incorporating PR feedback and adding an integration test
Rename SLLabel to SLStaticText
Merge pull request #203 from justinseanmartin/jmartin/add-support-for-labels

Add support for checking existence of labels
Add support for UIPickerViews in Subliminal
Support Picker controls that aren't used as the inputView for a text field

Other behavior added:
 - Special case UIDatePicker to not search below that element as it can significantly deteriorate performance
 - Added a series of test cases for both UIDatePicker and UIPickerView
 - Ensure that all the functionality works on both iOS6 and iOS7
PR feedback
PR feedback: Fixing documentation and some test names
Merge pull request #211 from justinseanmartin/jmartin/support-pickerview-controls

Add support for UIPickerViews in Subliminal