ECMASCRIPT 5 'use strict' cleanup, since we want strict mode

for the entire library, we don't need to contextualize 'use strict' to each prototype methods.

lib/stringbean.js

@@ -1,3 +1,4 @@
+'use strict';
 
 function Stringbean() { }
 
@@ -8,7 +9,6 @@ function Stringbean() { }
 * @return {String} The filtered string
 */
 Stringbean.prototype.escapeHTML = function(s) {
-  'use strict';
   return s.replace(/&/g, '&')
     .replace(/</g, '&lt;')
     .replace(/>/g, '&gt;')
@@ -22,7 +22,6 @@ Stringbean.prototype.escapeHTML = function(s) {
 * @return {String} The filtered string
 */
 Stringbean.prototype.unescapeHTML = function(s) {
-  'use strict';
   return s.replace(/&amp;/g, '&')
     .replace(/&lt;/g, '<')
     .replace(/&gt;/g, '>')
@@ -36,7 +35,6 @@ Stringbean.prototype.unescapeHTML = function(s) {
 * @return {String} The filtered string
 */
 Stringbean.prototype.removeAlpha = function(s) {
-  'use strict';
   return s.replace(/[^A-Za-z ]+/g, "");
 };
 
@@ -47,7 +45,6 @@ Stringbean.prototype.removeAlpha = function(s) {
 * @return {String} The filtered string
 */
 Stringbean.prototype.removeNonAlphanumeric = function(s) {
-  'use strict';
   return s.replace(/[^A-Za-z0-9 ]+/g, "");
 };
 
@@ -59,7 +56,6 @@ Stringbean.prototype.removeNonAlphanumeric = function(s) {
 * @return {String} The filtered string
 */
 Stringbean.prototype.removeNonNumeric = function(s) {
-  'use strict';
   return s.replace(/[^0-9-.]/g, "");
 };
 
@@ -70,7 +66,6 @@ Stringbean.prototype.removeNonNumeric = function(s) {
 * @return {String} The filtered string
 */
 Stringbean.prototype.removeNumeric = function(s) {
-  'use strict';
   return s.replace(/[0-9]/g, "");
 };
 
@@ -81,7 +76,6 @@ Stringbean.prototype.removeNumeric = function(s) {
 * @return {String} The filtered string
 */
 Stringbean.prototype.base64Encode = function(s) {
-  'use strict';
   return new Buffer(s).toString('base64');
 };
 
@@ -92,7 +86,6 @@ Stringbean.prototype.base64Encode = function(s) {
 * @return {String} The filtered string
 */
 Stringbean.prototype.base64Decode = function(s) {
-  'use strict';
   return new Buffer(s, 'base64').toString('utf8');
 };
 
@@ -103,7 +96,6 @@ Stringbean.prototype.base64Decode = function(s) {
 * @return {Boolean} true if it is JSON, false if not 
 */
 Stringbean.prototype.isJSON = function(s) {
-  'use strict';
   try {
     JSON.parse(s);
   } catch (e) {