merge in watterso_setup_automated_testing

added .idea to .gitignore for pycharm
pulled tests out of run.py, created adsb_test, ehs_test, and util test
moved the rest of runp.py into decode_test_data
changed imports and __init__ file so it doesn't contain magic

README.rst

@@ -109,3 +109,10 @@ Some helper functions:
     pms.hex2bin(msg)        # convert hexadecimal string to binary string
     pms.hex2int(msg)        # convert hexadecimal string to integer
     pms.bin2int(msg)        # convert binary string to integer
+
+Developement
+------------
+To run tests, run the following commands:
+```
+$ tox
+```