change the pure prompt char

minor change on the git UI

make the git prompt setting commented out by default

add git prompt setting for robbyrussell theme

reformat the git prompt setting in template

remove the validate set of enable-theme function

update the themeTemplate

update the template

update readme to fix a bug with installation

change the caption of the screenshots

add git-support screenshots

fix a error url

add screenshots to readme

testing screenshots

add screenshots