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
.htaccess file check added
Prevent that the charset is set twice
Remove custom headers from frontend
Decent output in production

Don't just throw errors when in production mode, this is developer information,
and shouldn't be handled as an exception, as it is probably an invalid request.
Merge branch 'master' into config-not-found
Merge pull request #539 from forkcms/config-not-found

Decent output in production
Replaced deprecated constant SPOON_CHARSET for container method.