Fixed google authorization popup. Fixes #495
Fixed viewer issues
Fixed focus on show modal
Fixed preview button drag on touch screen
Replace grunt by gulp
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Upgrade to mathjax 2.4
Fixed wkhtmltopdf parameters. Fixes #501
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Version 4.1.4
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Fixed end of line issue on IE
Fixed viewport issue with pageup/pagedown on chrome. Fixes #505
Fixed title editing issue on IE
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