Ignoring 'images' directory

We will need to discuss whether content in the images directory should
be tracked by git.  Ignoring it for now.
Adding files from the Mediawiki 1.18.1 release
Adding Widget extension

This extension is required by the SlideShare widget
http://www.mediawikiwidgets.org/SlideShare
Replacing tooltipAndAccesskey with tooltipAndAccesskeyAttribs

This is required otherwise stack traces are generated.  The
MediaWiki 1.18.1 Upgrading notes state: "When upgrading to
1.18.x custom skins may give errors. replace tooltipAndAccesskey
 with tooltipAndAccesskeyAttribs."
http://www.mediawiki.org/wiki/Release_notes/1.18#Upgrading
Inserting MyInfusion.js without addScriptFile

MediaWiki 1.18.1 was inserting MyInfusion.js at the bottom of each page,
after the first script element -- that was breaking Infusion.  This change
inserts it manually using another script element at the top of the page,
but without using the initPage method.  This should be addressed soon.
FLUID-4628: Modified menu item "Body/techniques/something?" to "Techniques".
FLUID-4630: First pass at improving handbook style.
Merge remote-tracking branch 'anastasia/mediawiki-1.18.1-styled' into upstream-mediawiki-1.18.1

* anastasia/mediawiki-1.18.1-styled:
  FLUID-4630: First pass at improving handbook style.
FLUID-4630: More changes: new fonts, new icon for external links
Merge remote-tracking branch 'anastasia/mediawiki-1.18.1-styled' into upstream-mediawiki-1.18.1

* anastasia/mediawiki-1.18.1-styled:
  FLUID-4630: More changes: new fonts, new icon for external links
FLUID-4630: Small fix to spacing under lists.
Merge remote-tracking branch 'anastasia/mediawiki-1.18.1-styled' into upstream-mediawiki-1.18.1

* anastasia/mediawiki-1.18.1-styled:
  FLUID-4630: Small fix to spacing under lists.
FLUID-4630: Addition of high-contrast versions of the 'external link' icon
Merge remote-tracking branch 'anastasia/mediawiki-1.18.1-styled' into upstream-mediawiki-1.18.1

* anastasia/mediawiki-1.18.1-styled:
  FLUID-4630: Addition of high-contrast versions of the 'external link' icon
FLUID-4630: Eliminate scrollbar on login link in IE9; eliminate gap above UIO button.
Merge remote-tracking branch 'anastasia/mediawiki-1.18.1-styled' into upstream-mediawiki-1.18.1

* anastasia/mediawiki-1.18.1-styled:
  FLUID-4630: Eliminate scrollbar on login link in IE9; eliminate gap above UIO button.
FLUID-4630: Change bullet for second-level li to a circle.
Merge remote-tracking branch 'anastasia/mediawiki-1.18.1-styled' into upstream-mediawiki-1.18.1

* anastasia/mediawiki-1.18.1-styled:
  FLUID-4630: Change bullet for second-level li to a circle.
FLUID-4630: Small adjustment to indenting of lists.
Merge remote-tracking branch 'anastasia/mediawiki-1.18.1-styled' into upstream-mediawiki-1.18.1

* anastasia/mediawiki-1.18.1-styled:
  FLUID-4630: Small adjustment to indenting of lists.