Pyqualtrics

* getPanel, importSurvey, activateSurvey, deactivateSurvey, getSingleResponseHTML functions

* Renamed parameters for consistency: library_id to LibraryID, panel_id to PanelID, name to Name
* New example: create panel, add recipient, send survey, delete panel

* Improved test coverage up to 80%
* importPanel function now automatically computes Email, LastName, FirstName and ExternalRef parameters
* Added command line tool "qualtrics"

* createPanel
* deletePanel
* getPanelMemberCount
* addRecipient
* getRecipient
* removeRecipient
* sendSurveyToIndividual
* getDistributions
* getSurvey
* getLegacyResponseData
* getResponse
* importPanel
* importJsonPanel