Add getopt module to deal with parameters

Available parameters are:
+ -h, --help
+ -u [url], --url=[url]
+ -d [max-depth], --max-depth=[max-depth]
+ --nofollow
+ --noindex
+ -m [me@domain.com], --email=[me@domain.com]
+ -c, --color (Not implemented for the moment)

nofollow and noindex features have been implemented in an attempt to get rid off unecessary warnings.
emails can now be sent with PDF attached.