TISTUD-3601 Allow users to specify to be warned about missing semicolons
  - look up severity of missing semicolon every parse (as opposed to once in constructor, or ever single time we encounter the issue)

Conflicts:
	plugins/com.aptana.js.core/parsing/JS.grammar
	plugins/com.aptana.js.core/src/com/aptana/js/core/parsing/JSParser.java