modify label parts
add more documents of ui
change the anchor point
add more details
setup the skeleton of the remaining writing
add more text to Label
add textfield document
add some texts to the new ui module
finish the feature list part of ui
add more document to ui part
change the format
add document for scale9sprite, imageview, text, textbmfont and textatlas
add more documents
finish the first draft of UI chapter
Merge pull request #5 from andyque/master

UI Chapter