Fix casing of JavaScript to match my README change, which broke tests

Author: stephendonner

lib/mapping.js

@@ -88,7 +88,7 @@ var options = {
       key: 'S',
       api: 'noscript',
       bool: true,
-      info: 'disable javascript (IE, Chrome, Firefox)'
+      info: 'disable JavaScript (IE, Chrome, Firefox)'
     },
     'clearcerts': {
       name: 'clearCerts',
@@ -283,7 +283,7 @@ var options = {
       key: 'c',
       api: 'custom',
       param: 'script',
-      info: 'execute arbitrary javascript at the end of a test to collect custom metrics'
+      info: 'execute arbitrary JavaScript at the end of a test to collect custom metrics'
     },
 
     // API only settings