Purpose of this project, is to provide a utility to download
web documents for offline viewing. (something like wget --convert-links)

** FEATURES **

*)Only downloads pre-defined content types.
*)Only downloads files and folders, below given url,
for example, when initial url is http://www.example.com/something/
program will download http://www.example.com/something/otherthing.html
but not download http://www.example.com/somefile.txt
*)Only downloads from given internet location, for example if initial url
was www.example.com, program won't download docs.example.com.
*)Fixes url's by checking if referenced file exists locally. If file exist,
converst url to relative url, if it is not, it converts url to full url.
*) url conversion is done for css and javascript documents too.

** Known Issues **
*) html parsers are slow and sometimes can't parse files correctly.
*) Doesn't support command line arguments as of now.

@ TODO:

Re-write parsers from scratch.
Implement multiprocessing
Implement command line arguments