• First, in __init__.py you should not add the class but the file name. (without .py extension)
• try restarting the server with the option -u your_module_name
• does you new module appear under settings / modules in the client? Otherwise: update module list
• if it doesnt work yet: make sure your addon is in the addons path (you can (among other ways) use something like this --addons-path=<normal_addons>,<your addons folder>)
• still not working? try to add a print line on the top of your new .py file and see if it is printed while starting the server

Please refer here: must you really restart OpenErp all the time to develop a module?

try to delete the *.pyc files of your module and then restart the openerp/odoo server.