Enabled MathJax safe mode just in case.
Merge branch '1.0-stable'

Conflicts:
	src/main/websources/lib/thm.de/arsnova/presenter/ui/mathJax.js
Coding style:
Added "use strict" statements to profiles.
Added parentheses around immediate function invocations for better
readability.
Added parentheses around regular expressions where slash character is
ambiguous.
Moved function definitions out of loops to prevent memory leaks.
Filter properties inside of for-in loops with hasOwnProperty.
Integrate code quality checks into build process

Add JSHint and JSLint plugins to Maven POM for JavaScript checks.
Add Maven site plugin configuration
Simplify invocation of Maven build process

A development environment can now be setup with a single invocation of
the Maven executable: mvn -Denv=<ENV> -Prun-server clean jetty:run.
Update Git workflow description