Fix wrong boolean values parsing

[alpiquero]

bool type fields were parsing at line 152 using

data[k] = bool(v)

This will always return True if the content of the v variable is not the empty string.

I changed that line to

data[k] = str(v).lower() == 't'

[MikelMoreno]

Hi @dgunter,

Could you please add the opened pull requests to the branch? (Goes for #8 #9 #10 too)

This are minor changes but can help people get the clean version of the project without having to modify the code themselves.

Thanks in advance!