Add some support for JavaScript

It adds new syntax groups for JavaScript and it relinks some existing
ones to have a better color scheme.

colors/odyssey.vim

@@ -299,6 +299,16 @@ else
   let g:java_ignore_javadoc = 1
 endif
 
+" }}}
+" JavaScript Highlights {{{
+
+call s:l(       'javaScriptFunction', 'Statement')
+call s:l(         'javaScriptBraces',    'Normal')
+call s:l(     'javaScriptIdentifier', 'Statement')
+call s:l( 'javaScriptOdysseyKeyword',   'Keyword')
+call s:l('javaScriptOdysseyFunction',  'Function')
+call s:l('javaScriptOdysseyFatArrow', 'Statement')
+
 " }}}
 " Python Highlights {{{