start index_spec
add guard and spring to make test faster
use showdown lib to make the markdown convertion
write a coffee class for convertion
add some css for text input
change id,class to aaa-aaa style
can upload md file.Store it to DB
add test for upload file
add module methods for convertion to lib/
use highlight and pygment to hightlight code
use vim style for pygments
Merge pull request #2 from peterzd/upload_file

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