Merge pull request #1 from otakky/trunk

make lib/pdf2jpg.js for convert a pdf file to jpg files.
clean up & added node-pdfreader
modify readme
remove lib dir
change output dir
add slide finder
update "upload styles and front controller"
modify readme
add uploader by xhr2 & mock of slide page
add slide page
clean up
ajust style
support tags
adujst css(#page-upload)
add zoom icon (#page-slide)
add zoom function

  remaining task: add css for fullscreen mode.
add uploaded for post method