Prefer the Python from virtualenv
Prefer the Python from virtualenv

Helps when there are other Python in $PATH. Will make operations involving Python to run in a correct environment. Will not help to operations runnign "pio" or "platformio" directly when there are other "pio" or "platformio" commands in $PATH.

Issue #78
platformio/platformio-atom-ide,platformio/platformio-atom-ide