Add objc syntax highlighting, closes #77

ftplugin/objc.vim

@@ -0,0 +1,10 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'objc') == -1
+  
+" Use C++ style comment strings with commentary.vim
+setl commentstring=//%s
+
+" Search for include files inside frameworks (used for gf etc.)
+setl includeexpr=substitute(v:fname,'\\([^/]\\+\\)/\\(.\\+\\)','/System/Library/Frameworks/\\1.framework/Headers/\\2','')
+
+
+endif