code: function stringCase(str, caseValue) {
  		switch (String(caseValue || '').toLowerCase()) {
  			case 'lower':
  				return str.toLowerCase();
  			case 'upper':
  				return str.toUpperCase();
  		}
  		
  		return str;
  	}
docs: Helper function that converts string case depending on
  <code>caseValue</code>
  @param {String} str String to transform
  @param {String} caseValue Case value: can be <i>lower</i>,
  <i>upper</i> and <i>leave</i>
  @returns {String}