code: function(str, symbol, replace) {
  			var i = 0;
  			var il = str.length;
  			var sl = symbol.length;
  			var matchCount = 0;
  				
  			while (i < il) {
  				if (str.charAt(i) == '\\') {
  					// escaped symbol, skip next character
  					i += sl + 1;
  				} else if (str.substr(i, sl) == symbol) {
  					// have match
  					var curSl = sl;
  					matchCount++;
  					var newValue = replace;
  					if (_.isFunction(replace)) {
  						var replaceData = replace(str, symbol, i, matchCount);
  						if (replaceData) {
  							curSl = replaceData[0].length;
  							newValue = replaceData[1];
  						} else {
  							newValue = false;
  						}
  					}
  					
  					if (newValue === false) { // skip replacement
  						i++;
  						continue;
  					}
  					
  					str = str.substring(0, i) + newValue + str.substring(i + curSl);
  					// adjust indexes
  					il = str.length;
  					i += newValue.length;
  				} else {
  					i++;
  				}
  			}
  			
  			return str;
  		}
docs: Replaces unescaped symbols in <code>str</code>. For example, the '$' symbol
  will be replaced in 'item$count', but not in 'item\$count'.
  @param {String} str Original string
  @param {String} symbol Symbol to replace
  @param {String} replace Symbol replacement. Might be a function that
  returns new value
  @return {String}