Add a try/catch in query.encodeValue

This change enables converting values containing special characters, such as the percent sign (%), to strings, by always encoding values for which the check if encoding is actually necessary has failed.
For values containing URI escape characters, the check throws an error (because they are not decodable), but we still need to encode them.

Fixes persvr#75

query.js

@@ -79,28 +79,32 @@ function encodeString(s) {
 exports.encodeValue = function(val) {
 		var encoded;
 		if (val === null) val = 'null';
-		if (val !== parser.converters["default"]('' + (
-				val.toISOString && val.toISOString() || val.toString()
-		))) {
-				var type = typeof val;
-				if(val instanceof RegExp){
-					// TODO: control whether to we want simpler glob() style
-					val = val.toString();
-					var i = val.lastIndexOf('/');
-					type = val.substring(i).indexOf('i') >= 0 ? "re" : "RE";
-					val = encodeString(val.substring(1, i));
-					encoded = true;
-				}
-				if(type === "object"){
-						type = "epoch";
-						val = val.getTime();
-						encoded = true;
-				}
-				if(type === "string") {
-						val = encodeString(val);
+		try {
+			if (val !== parser.converters["default"]('' + (
+					val.toISOString && val.toISOString() || val.toString()
+			))) {
+					var type = typeof val;
+					if(val instanceof RegExp){
+						// TODO: control whether to we want simpler glob() style
+						val = val.toString();
+						var i = val.lastIndexOf('/');
+						type = val.substring(i).indexOf('i') >= 0 ? "re" : "RE";
+						val = encodeString(val.substring(1, i));
 						encoded = true;
-				}
-				val = [type, val].join(":");
+					}
+					if(type === "object"){
+							type = "epoch";
+							val = val.getTime();
+							encoded = true;
+					}
+					if(type === "string") {
+							val = encodeString(val);
+							encoded = true;
+					}
+					val = [type, val].join(":");
+			}
+		} catch (conversionError) {
+			// The conversion necessity check has failed and we have not encoded the value. The next conditional block will take care of it.
 		}
 		if (!encoded && typeof val === "string") val = encodeString(val);
 		return val;