[#42646511] Change tubes attribute name to tubes_description
[#42646797] Add tube rack transfer action
[#42646797] Define NoTubeInTargetLocation exception
[#42646797] Add tube rack transfer spec
[#42646797] Tube rack transfer specs pass
[#42646797] Refactor spec to use tube_rack factory
[#42646797] Fix parameter name to tubes
Fix create tube rack failing specs.
Bump version to 0.26.1
Update doc.
Merge pull request #95 from maxigit/42646797_add_rack_transfer_action

42646797 add rack transfer action