Added unittest command to README

Merge pull request #25 from voxter/delete-node

Add deleteNode method for the DELETE /REST/Node/<zone>/<FQDN>/ resource

Fixed useragent version

Version bump to 0.10.1

Version bump to 0.10.0

Added a better error message for non HTML/text mail sending

Version bump in README

Added getNodeList() function to zone

Fixed test issue introduced in the last release

Updated default HTTP timeout in base client to 5 minutes