v0.3.0

implement nameserver, vlan and l2domain module (#13)

* fix documentation
* Add nameserver module
* Add nameserver test files
* Modify `phpipam_helper.py` to work with tools controllers
* add tar.gz to clean target
* simplify tools controller handling
* prepare helper for vlan
* add vlan module
* add vlan test files
* add l2domain module
* add l2domain test files
* add special cases to `phpipam_helper` to fix issues with api
* add documentation
* prepare release