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Merge branch 'master' into jingxian2
Parametric function example
Parametric function example 2

Changed the x,y axis positions to the center.
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"Save As…" button text and title changed
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Question mark and explanation for Root and Share

The question mark and meaning to Root and Share checkbox have been
added.
Question mark and explanation for Root and Share

Marked the first question mark with Root. May need variables for
description strings.
Question mark for URL

Added question mark and description to URL in author mode.
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Conflicts:
www/index.html
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Update jingxian2
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Merge branch 'master' into jingxian2
Merge branch 'master' into jingxian2

Conflicts:
	www/math-parser
Bug fix 2415
Merge branch 'jingxian2' of http://github.com/bvds/LaitsV3 into jingxian2
Merge branch 'master' into jingxian2