Add TransIP DynDNS support

[mgroenhoff]

I have been using an older version of this code for quite some time now and finally found the time to polish and submit it.

Please excuse my python because I almost never code in it.

API Docs: https://api.transip.nl/rest/docs.html#header-authentication

Relevant Account Settings:

• Username: your TransIP username
• Password: Generate a new key-pair at the control panel and paste the private key in PEM format in this field (Make sure to disable the IP filter flag. Because DynDNS)
• Zone: One of the domain names listen in the control panel
• Hostname(s): The DNS entry record names to update. For example: "@,*"
• TTL: Speaks for itself