Modify ImportConfig to allow the QA baseurl to be configurable

Deprecate usage of InitFileLoader to hold the feedback methods
Allow command-line importer to set the QA base URL

Add the description for the new qa_baseurl to the advanced usage description
Expose the new qa_baseurl argument to the CLI import plugin

Also group all arguments related to the feedback in the help
Remove double space after operator
Merge pull request #5 from sbesson/import-html

Add logic to set the QA baseurl via the command line importer