Merge pull request kbsali#118 from kbsali/params

Params

add autoloader for manuel static install

add support for multiline descriptions

backport SimpleXMLElement strict mode

add support for user impersonation

reach 100% test coverage

greatly improve test coverage + minor improvements

added multiple tests to stabilize the lib

fix string escaping, add public lastCallFailed() method, add possibil…

…ity to add customer auth header

fix upload header