tagpage syntax: Adds a syntax to create links to pages with a given tag.
Empty results will appear as "red" link. If one page is found, the link will
directly link to the page. If more than one page with the given tag exists,
the link will show an overview of the pages.
Syntax: {{tagpage>foo|All pages with tag foo}}

(Fixes #68)
tagpage syntax: Added "color" option which disables the cache and differs between
existing and non-existing pages (link appears red or green)
tagpage syntax: move create link logic to a seperate function / Do not link directly to a page / disable caching only in dynamic mode
E. g.: {{tagpage>foo&dynamic|Link description}}
Merge "tagpage syntax: Adds a syntax to create links to pages with a given tag"
Implement the $num parameter in getTopic()
tagLink helper: Add custom title and dynamic link color features
Code cleanup and fixes for the tagpage syntax

- use the "normal" mode, i.e. tag links can be used inside normal text
  now and won't end the current paragraph
- use the tagLink-helper which has the following differences (now):
   - links to the page tag:$tag if it exists
   - with the dynamic feature links are only displayed as existing if
     there are tagged pages that are actually listed (and not hidden
     because they are hidden, the user can't access them, ...)
   - tags are cleaned before the index lookup so results are also found
     if the tag is supply in a different but equivalent variant
- disable only the xhtml cache and not also all other caches
- the renderer returns false for all other formats in order to signal
  that it doesn't support them (used by the text renderer for example)
- allow "|" in the title
Fix the authentication type annotation for the current DokuWiki version

Even though this means that now the annotation is incorrect for older
DokuWiki versions this doesn't break anything as this only in the code
documentation that is used by IDEs but not by PHP itself.
Remove the Technorati ping feature, fixes #82

Technorati hasn't been using any pings anymore since October 14, 2009
according to http://technorati.com/ping/ so it's about time that the
feature is removed from the tag plugin, too.
New version 2013-04-05

Changes:
  * New tagpage feature for creating a link to the list of all pages with
    a certain tag without tagging the page
  * Removed the Technorati ping feature as Technorati is no longer using
    any pings