CommonUri added.

Contains two functions: getFilename + getUrl.
CommonUri: @param comment updated
Changelog improvement added
CommonUri: decoding htmlspecialchars
CommonUri: remove special characters by their normal character
CommonUri: return added
CommonUri: reserved characters (RFC 3986) comment updated
CommonUri: '|' needs to be replaced
CommonUri: removed redundant space, etc...
SpoonFilter::urlise replaced by CommonUri::getUrl
CommonUri: RFC comment changed
CommonUri: additional cleanup added
self not found, needed to be SpoonFilter
Remove "-" before a file-extension
Trim '-' before a file extension point
Clean leftovers
Removed duplicated clean leftovers
Clean leftovers
Added urlencode to extra rule
SpoonFilter removed from CommonUri::getUrl()