Update pandoc-command.coffee

Close #7
Update pandoc-command.coffee

Split pandoc args string via its option instead of whitespace.
Update pandoc-command.coffee

Add shallow quote trim.
Should match options greedily

Changed
/(-[\w-]+?)\s*/gm 
to 
/(-[\w-]+)\s*/gm
Use \S instead of \w

Support long options like `--css=dir/to/style.css`
Merge pull request #8 from Dashed/patch-1

Update pandoc-command.coffee