Merge pull request #83 from caok/master

update some rspec for resources
updated the gemfile to remove unuse debugger
Merge pull request #84 from hlee/master

update gem
modify readme, add mac stepup env
add authenticate_user! filter in user controller, fixed get /users exception
test login in & user show action
Merge pull request #86 from mouse-lin/master

modify readme & fixed some bugs, add the test too
实现pdf在线阅读，利用的是pdfjs
modify a readme.md