add typing indicator. close #58. ref #172.
add VC properties to easily show/hide typing indicator. update demo. ref #172
close #221. refactoring.
clean up. docs fixes. asserts.
clean up. docs. asserts.
clean up. docs. asserts.
clean up. docs. asserts.
refactor toolbar content view prop names
clean up. docs. asserts.
clean up docs
add finishReceivingMessage. ref #172
update travis script
simplify travis script and schemes
fix layout and rotation bugs and constraint warnings
demo comments
fix layout bug
proj organization
begin formatter tests
remove spaces from test directory names
formatter tests