Mods get_data_bounds to ignore fill_value

Fixes the get_data_bounds function such that it ignores the designated fill_value when calculating the min / max values in a parameter

Also added handling to only operate against QuantityType and ConstantType - bounds don't really apply to other types!!
Merge pull request #10 from blazetopher/expand_tests

Expands test coverage
Merge pull request #9 from blazetopher/fixes_data_bounds

Mods get_data_bounds to ignore fill_value
Fixes typo; increases timeout in tests
Adds utility method for determining the effective length of a sliced array
Adds support to insert_timesteps to be out of band.
Merge pull request #11 from blazetopher/replay_alignment

Replay alignment
Adds verbosity and loc options to rmcovs.py
Bumped pyon and ion-defs refs
Increases default brick_size to 10k
Adds test_data to .gitignore

Changes to files in test_data must be made forcefully.
Fixes read-only support

Addresses a couple spots where opening the coverage in read-only ('r') mode wasn't being respected properly.

Addresses [OOIION-664](https://jira.oceanobservatories.org/tasks/browse/OOIION-664)
Merge pull request #12 from blazetopher/mode_fix

Mode fix
Clean up setup links