Fix the issue when selling a example product

    * Fix the issue when try selling a example product in the point of sale
      with NFe plugin and virtual fiscal printer enabled.

Change-Id: I862456e347be1894b7ed09e9b860d1ff76cc6709
Move dependencies to requirements.txt

This makes it easier for anyone trying to install virtualenv dependencies,
while keeping install_requires on setup.py unchanged

Change-Id: I242bd3fcbc91f90b9f636eb36f5361e331f004e0
Merge "Fix the issue when selling a example product"
Update utils submodule

Change-Id: Ifcd0ed7c92dd1b57bb69e0d79d27bc7d69ba5803
Bugfix release 0.9.21.1

Change-Id: I8ecff73301f434fb73c6e0f46696d8a2668baadc
Also print message in virtual printer.

Change-Id: I4a1db2d6910b564d3c6f2fda69b34b6c1da43fee
Merge "Bugfix release 0.9.21.1"
Update utils submodule

Change-Id: If862c8cd4304c2b945d1be7dd908f5b99f544115
[MERGE] From Stoq repo