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
Check if container is set before setting charset
Because no container is set when requesting the installer
Nicer event tracking in Google Analytics
Add category questions to front-end page

Add only the questions of a category to a front-end page using the
widget selector
Fixed padding so it respects the code style guidelines
Preparing for release
Fork Standards applied
Removed trailing spaces