Added support for acl's

* aclrule methods in network.rb
* auto adding of "tag" and "schema" in natrule_create xml
* support for nested tags in "build_request_xml_body" in xml.rb
Adding networks now possible
Added examples section to readme
Default password for a server
Fixed typo
Introduced simple http get

This method does not parse the response body.
Used for reporting methods.
Started adding report download functionality
Summary and detailed usage
Fixed argument order bug
various bugfixes
small bug fix
Can now create server farms
Add and remove from server farm

These need another type of body (no xml, but simple parameters)
cleanup
Fixed server pw bug
Adding vip's
Merge pull request #2 from ddccffvv/master

Support for acl, networks, reporting, server farms, vips,...