Change sanitize_url method of the LinkPattern class so it can handle Twitter pic URL

[ap-Codkelden]

When parsing links like Twitter pics with size attribute (see Twitter docs), e. g. this, Python-Markdown return HTML tag <a> with empty href attirbute, because sanitize_url make of colon in "path", "parameters", "query" or "fragment" is suspect.

[coveralls]

Coverage increased (+0.01%) to 92.94% when pulling 5a41ea0 on ap-Codkelden:master into ce24238 on waylan:master.

[coveralls]

Coverage increased (+0.01%) to 92.94% when pulling 5a41ea0 on ap-Codkelden:master into ce24238 on waylan:master.

[waylan]

Just don't use 'safe_mode'. In fact safe_mode is deprecated will be removed in the next release. Therefore I see no reason to make any changes to it. If you don't like its current behavior then you should turn if off and use a different solution (like Bleach, as suggested in the docs). See the release notes for more details.

[ap-Codkelden]

A, ok. Thank you for explanation.