Resolve "tag version 4.0.0"

Closes #44

See merge request !42

Resolve "[mkonstanty-19] add python 3 support"

Closes #38

See merge request !36

Resolve "tag version 3.0.0"

Closes #43

See merge request !41

Resolve "Isolate applying of configuration."

Closes #39

See merge request !39

Resolve "tag version 2.1.0"

Closes #42

See merge request !40

Merge branch '41-according-to-reamde-default_policy-can-by-set-to-one-of-accept-reject-drop-while-reject-is-not' into 'master'

Resolve "Remove REJECT from default policy options"

Closes #41

See merge request !38

Resolve "[mkonstanty-18] test action configure rules action SNAT"

Closes #37

See merge request !35

Resolve "[mkonstanty-17] test action configure rules action DNAT"

Closes #36

See merge request !34

Resolve "[mkonstanty-16] test action configure default policy"

Closes #35

See merge request !33

Resolve "[mkonstanty-15] test action configure rules action REJECT"

Closes #34

See merge request !32

Resolve "[mkonstanty-14] test action configure rules action DROP"

Closes #33

See merge request !31

Resolve "[mkonstanty-13] test action configure rules action ACCEPT"

Closes #32

See merge request !30

Resolve "[mkonstanty-12] test action configure table nat"

Closes #31

See merge request !29

Resolve "[mkonstanty-11] test action configure table filter"

Closes #30

See merge request !28

Resolve "[mkonstanty-10] test action configure rules comment"

Closes #29

See merge request !27

Resolve "[mkonstanty-9] test action configure rules destination_ports"

Closes #28

See merge request !26

Resolve "[mkonstanty-8] test action configure rules destination_port"

Closes #27

See merge request !25

Resolve "[mkonstanty-7] test action configure rules source_port"

Closes #26

See merge request !24

Resolve "[mkonstanty-6] test action configure rules icmp_type"

Closes #25

See merge request !23

Resolve "[mkonstanty-5] test action configure rules protocol"

Closes #24

See merge request !22