Fix failing user form stylesheet
CMS-1995 Display menu buttons at top and bottom
CMS-272 Upgrade CodeMirror to version 3.15
- replace word match highlighter with tag match highlighter
CMS-1923 Implement createImagePlaceholder XSLT function
HtmlArea: tiny code refactoring
CodeArea: fix wrong border color for the 'box'
CMS-1923 Implement createImagePlaceholder XSLT function. Changed to png. NullPointerException in code when using gif.
Merge branch 'master' into es-0.9.3-upgrade
CMS-1996 Upgrade ES to 0.90.3 for testing

Added test