beta3

* an awesome updating step
* error message when install folder exists
* more tests before installation (write access, etc.)
* updated README to make installation easier
* german language thanks to HLFH
* spanish language thanks to Nitche
* new file ./inc/poche/myconfig.inc.php created to store language and salt
* #119: salt is now created when installing poche
* #130: robots.txt added
* #136: error during readability import
* #137: mixed content alert in https
* #138: change pattern to parse url with #