BINDINGS: Added the Cocoa/Objective-C one

... and sorted the bindings after the languages, alphabetically

Reported by: Mike Abdullah

docs/BINDINGS

@@ -6,12 +6,8 @@ advantage of libssh2 directly from within your favourite language.
 The bindings listed below are not part of the libssh2 distribution archives,
 but must be downloaded and installed separately.
 
-
+Cocoa/Objective-C
-Python
+  https://github.com/karelia/libssh2_sftp-Cocoa-wrapper
-  pylibssh2 - http://www.wallix.org/pylibssh2-project/
-
-PHP
-  ssh2 - http://pecl.php.net/package/ssh2 
 
 Haskell
   FFI bindings - http://hackage.haskell.org/package/libssh2
@@ -19,5 +15,11 @@ Haskell
 Perl
   Net::SSH2 - http://search.cpan.org/~rkitover/Net-SSH2-0.45/lib/Net/SSH2.pm
 
+PHP
+  ssh2 - http://pecl.php.net/package/ssh2 
+
+Python
+  pylibssh2 - http://www.wallix.org/pylibssh2-project/
+
 Ruby
   libssh2-ruby - https://github.com/mitchellh/libssh2-ruby