add buttons for help
add string to xml doc
finish adding button, still need to hook up
change dp for sp for text size
generalize dialog creation process, add dialog for button on crop activity
question mark button active on each stage of ad creation
remove ivar in AdCreationManager and add documentation
fix crop activity layout
Merge pull request #102 from rpandey1234/addHelpers

Add question mark button to each activity for instructions in ad creation