Color customization

Ability to change text buttons and pager colors.
Merge branch 'master' of https://github.com/pventura1976/LAWalkthrough into pventura1976-master

Conflicts:
	LAWalkthrough/LAWalkthroughViewController.h
	LAWalkthrough/LAWalkthroughViewController.m
Few changes to proposed merge
Merge branch 'pventura1976-master'