Update Mark All as Read button text color to the obaGreen color. (#1115)
Update Mark All as Read button text color to the obaGreen color. (#1115)

* Update Mark All as Read button text color to the obaGreen color.

Fixes https://github.com/OneBusAway/onebusaway-iphone/issues/1100 - Tint color of "Mark All" button is wrong

* Can't directly use markReadButton.tintColor, instead we need to
use setTitleTextAttribute to change the text color.

* Set UIBarButtonItem text color in OBATheme

OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,ualch9/onebusaway-iphone,cathy810218/onebusaway-iphone,OneBusAway/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,cathy810218/onebusaway-iphone,themonki/onebusaway-iphone,themonki/onebusaway-iphone,themonki/onebusaway-iphone,OneBusAway/onebusaway-iphone,cathy810218/onebusaway-iphone,themonki/onebusaway-iphone,cathy810218/onebusaway-iphone,ualch9/onebusaway-iphone,ualch9/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone