clean up old screenshots
drop iOS 6 support. remove iOS 6 assets. strip iOS 6 code. ref: #172
begin new collection view storyboard
storyboard
stub out collection view classes
stub out collection view cells
initial setup and layout for collection view and cells. complete layout for outgoing cell prototype. ref: #172
streamline previous delegate design. messageType delegate method not needed because we have message.sender
complete layout for incoming cell prototype. tweak layout cell spacing. enable landscape mode. handle layout on rotation. ref: #172
Merge branch 'master' into version_5_release
new custom input toolbar with content view. ref: #172
use DAKeyboardControl for keyboard show/hide. ref: #172. closes #118.
rename storyboard. refine collection view insets.
hookup cell constraint outlets.
refactor collection cell properties and add default values.
tweak defaults. edit demo. ref: #172
refine cell properties, constraints, getters, setters.
refine use of constants and default values. finish collection cell setters. ref: #172
refine input textview
refactor color category