Stasm pineyes fix

For some reason, the conversion for the ```pinEyes``` variable from a ```QVariantList``` to a ```QStringList``` wasn't working correctly.  More confusing is that this bug showed up now.  In any case, this branch fixes the aforementioned issue.  
@sklum Is this supposed to be capatable with existing code? I receive the following error now: 
> Fatal: Failed to set QVariantList br::StasmTransform::pinEyes to: [(66.24,114),(125.76,114)]
>   SDK Path: ~/src/openbr/dist
>   File: ~/src/openbr/openbr/openbr_plugin.cpp
>   Function: void br::Object::setProperty(const QString&, QVariant)
>   Line: 871