Slope triangle documentation
Change the properties of the slope triangle glider to fixed.
Add comment in sketc reader.
Fixing Env.isTouchEvent for IE8

Using Modernizer approach to detecting touch events as in IE8 this method was thorwing a "Object doesn't support this property or method". hasOwnProperty seems to be undefined for document.documentElement
Merge pull request #66 from Learnosity/fix/istouchdevice

Fixing Env.isTouchEvent for IE8
Check for null elements in texts.
Merge branch 'master' of github.com:jsxgraph/jsxgraph
Improved Text.updateSize() method
Catch some errors in createTransformation.
Remove updateSize for texts in transformImage
One mor change for transformInage()
Experiments with transformations of internal texts in IE8
prevent updateSize() calls for the infobox
Check for the position of upper left corner at most every 500 msecs. Turn off (for testing) Text.updateSize() calls for HTML texts.
Comment out forcing updateSize() calls for all HTML texts.
Reduced number of updates required on new Text by abstracting out of _setText the logic that sets the updateText function
etting the helper glider invisible
Merge pull request #69 from Learnosity/refactor/textSetText

Reduced number of updates required on new Text by abstracting out of _setText the logic that sets the updateText function
Allow Sector.setRadius() from JessieCode
Some comments
Merge branch 'master' of github.com:jsxgraph/jsxgraph