added Vagrantfile and bootstrap file.
added missing namedtuple name.
removed blank line.
added test cases for the verzamelend.register_callbacks methods.
fixed call.
implemented tests for verzamelend.Config.getBool() and verzamelend.Config.getInt().
added tests for verzamelend.Config.getStr().
implemented test for verzamelend.Config.getValue() and tweaked previous test cases.
if position argument is passed then configuration item is expected to be a list or tuple.
position keyword argument default value changed from 1 to None.
position keyword argument default value changed from 1 to None.
changed if statement.
added return clause.
added more tests for getValue() function.
added tests.MockConfig class.
use tests.MockConfig class.
added Plugin.configuration.
added Plugin.CONFIGURATION variable.
changed configCallback() to class method.
implemented tests for verzamelend.Plugin.