Merge pull request #2 from Infern1/master

Diverse veranderingen
Merge pull request #6 from Infern1/master

Configurable temp output and timeout for socket
Conditional loading of MySQLdb module

Not all users have have the MySQL module, so moved the import to the
mysql import section. This way it's only loaded if it is needed.

And cleaned the loading of modules slightly.
Changed behaviour of settings

Now users can create an own config.cfg, which will overwrite the
settings of config-org.cfg. By adding config.cfg to the .gitignore the
file will be preserved during a update with git.
Dynamic inverter request strings

The binairy string used for requesting data from the inverter is now
generated from the wifi kit s/n. How this string is generated is
explained in the function self.
Update the use of temperature reading, now outside temp is fetched from the web
Added prelim support to upload Smart meter (slimme meter) data