Find start and end index of text line for <code>from</code> index
@param {String} text
@param {Number} from
function(text, from) {
			var len = text.length,
				start = 0,
				end = len - 1;
			
			// search left
			for (var i = from - 1; i > 0; i--) {
				var ch = text.charAt(i);
				if (ch == '\n' || ch == '\r') {
					start = i + 1;
					break;
				}
			}
			// search right
			for (var j = from; j < len; j++) {
				var ch = text.charAt(j);
				if (ch == '\n' || ch == '\r') {
					end = j;
					break;
				}
			}
			
			return require('range').create(start, end - start);
		}