fixed #1 header tag's margin
add default theme font-family - AppleNeoGothic font
change default font-family set
change default font-size 1em -> 0.9em
Merge branch 'master' of github.com:rhiokim/markdown-css

* 'master' of github.com:rhiokim/markdown-css:
  base code font-size 1.1em in haroopad