Update README.md
datetime_to_epoch now takes into account the milliseconds
Fix TestAggregatedActivity test case
Merge pull request #93 from Anislav/fix/datetime-convertion

datetime_to_epoch now takes into account the milliseconds
Update CHANGES
fix old feedly import example
update resources
update roadmap
make it easier to use custom cassandra models
add docs
Merge pull request #94 from tschellenbach/custom_cassandra_model

Custom cassandra model
fix code sample syntax