added default attributes to RawEDF. added append test for RawEDF.
had to add brackets to some attributes in order to append a list of instances
Merge pull request #970 from leggitta/edf_append_fix

FIX append function for RawEDF
FIX : avoid warning in test_time_gen.py
wip py3k
add six
fix init
update decorator for python 3
FIX: Fix decorator
FIX: Use cleaner check than map using builtin
FIX: Many fixes for py3k
FIX : catch warning in time gen