Modules: Added GPIO module and parameter option.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
GPIO: Reading pin values.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
GPIO: Changed module layout in preparation for POST options.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
GPIO: Working gpio control in REST api.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
I2C: Added i2c module, works.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Merge branch 'master' of https://github.com/matematik7/duda-raspberry