Add DNS API support for aliyun (#410)

* Add DNS API support for aliyun

* Update README.md

* format

* format

* format

* format...

* format...

* format

* format

* fix bug

* fix bug

* code format

* code format

* fix bug

* just ok...

* fix bug

* fix bug

* fix bug

* change "echo" to "printf"

* fix bug

* code format

* fix bug."head -c" in function _ali_nonce not supported by solaris

* fix bug."head -c" in function _ali_nonce not supported by solaris

* format

* fix bug._ali_nonce not work on solaris

* fix bug. _ali_nonce not work on solaris

* fix bug. _ali_nonce not work on solaris

* add aliyun.com to README.md

README.md

@@ -260,6 +260,7 @@ You don't have to do anything manually!
 1. LuaDNS.com API
 1. DNSMadeEasy.com API
 1. nsupdate API
+1. aliyun.com(阿里云) API
 
 **More APIs coming soon...**