Merge branch 'master' of git.astron.nl:lofar2.0/pypcc

.gitignore

 **/env
 **/__pycache__
 **/*.pyc
+**/.DS_Store

i2c/I2C.py

+if os.sys.platform is 'linux':
     import pylibi2c;
 import time
 import logging

requirements.txt

-pylibi2c (github.com/amaork/libi2c)
+git+https://github.com/amaork/libi2c.git; platform_system == "linux"
 opcua
 numpy
 recordclass