rework configs for new feature
add test for one onramp per messaging fabric
able to send messages to sqs
receiver_sqs added and compiles
tests pass
added receiver polling logic
fixed configuration issues for FabricInput/Output
used better inheritance patterns
use more assertions
all configurable timestamps in millis for consistency
moved functionality from tesld/main.go to tesl.go
this will make it easier to write end to end tests of tesl
test of sqs production and consumption through tesl
crypto
updated to 32 byte key
sepearate out apply default/validate functions
to allow for more granular unit testing
support polling multiple messages at once
simpler sqs polling, misc cleanup
fixed crypto bug, better producer types
check if env variable set (eventually moved to config file)
Merge pull request #10 from collectivehealth/feature/sqs

Feature/sqs merge - may have updates after review