update release note for v0.8
add intro image for v0.8
update for v0.8 manual
update shortcut
fixed jquery.oembed custom
add spinner & style
fixed table heading
update for v0.8.0-rc1
fixed marked.js
Merge branch 'gh-pages' of github.com:rhiokim/haroopad into github/gh-pages

* 'gh-pages' of github.com:rhiokim/haroopad:
  Correct misspellings and improve wording.