Enh: factorized and cleaned loadPage into a common class and use it.

- Better not to catch Exception so to get full traceback of eventual errors.
- Also print a cleaned version of the response content. So to help debug.
Fix: in debug mode the locals() also contains the 'parameters' key, which given to the method raises an unexpected keyword error.
Cleaned travis script.

also forgot need html2text.
Fix: the config for tests. Factorized in a fixit() function.
Fix travis: Need  okconfig/templates & examples directories.