minor fixes and improvements
base form elements added
sectioning elements added (article, header, footer, section, etc)
Merge remote-tracking branch 'origin/master'
sup tag fixed
form textarea added
script element fixed
specialized inputs impl
fixes #150
more html text formatting elements added (cite, del, ins, var...)
media elements added (audio, video, source)
NegativeNumberException was removed
Format exception message.
Craete larger file to run download test.
Remove unnecesary task dispatching.
Configurable output buffer.
Note on default options.
Exit if file cannot be read & optimize buffer allocation.
Bump ceylon.json module version to 1.0.1
Added line/column info to json parser and added ParseException #156