XWIKI-10676: Create an Icon Theme Application.
[XWIKI-3544] Cache component resources needed for flawless document caching
[XWIKI-3544] Skin extensions should be always aware of caching document, otherwise they won't work
[misc] Add licence headers
[XWIKI-3544] Add legacy support for Skin extensions + tests
XWIKI-10688: When XWiki is configured for ultra short URLs, links to the homepage become links to the current document
Fixed.
XCOMMONS-620: Move WikiStream generic part to commons filter
* looks like Eclipse refactoring forgot a method...
XWIKI-10689: Upgrade to JFreechart 1.0.18
Merge pull request #304 from DarkKnightCZ/XWIKI-3544

[XWIKI-3544] Fix rendering cache for on-demand extensions
XWIKI-10692: Upgrade to Joda-Time 2.4
XWIKI-10676: Create an Icon Theme Application.

* Done on the API side
Merge branch 'feature-icon-theme'
XWIKI-10676: Create an Icon Theme Application.

* Fix bad @version tags.
XWIKI-10694: Upgrade to xalan 2.7.2
 XWIKI-10676: Create an Icon Theme Application.

* Fix components.txt
[misc] Remove useless code
XWIKI-10689: Upgrade to JFreechart 1.0.19
XWIKI-10717: The wysiwyg editor configuration doesn't fallback on the main wiki when local configuration document is missing
* Make sure the class reference points to the main wiki in case of a fallback.
 XWIKI-10676: Create an Icon Theme Application.

* Adding the UI.
XWIKI-10674: Cannot load CSS files from webjars
* Make sure the resource stream supports mark & reset so that Tika can determine the content type without affecting the stream (because it may have to read a few bytes from the start of the stream and thus needs to be able to reset the stream).