Bank raise on unsupported kwargs

[d-chambers]

This PR ensures both EventBank and WaveBank raise a newly defined UnsupportedKerword exception when, well, an unsupported keyword is used.

Addresses #207

[codecov-io]

Codecov Report

Merging #214 (e6d647d) into master (9697c5d) will decrease coverage by 0.00%. The diff coverage is 98.03%.

@@            Coverage Diff             @@
##           master     #214      +/-   ##
==========================================
- Coverage   97.43%   97.43%   -0.01%     
==========================================
  Files          37       37              
  Lines        4284     4320      +36     
  Branches      670      677       +7     
==========================================
+ Hits         4174     4209      +35     
  Misses         52       52              
- Partials       58       59       +1     

Flag	Coverage Δ
unittests	97.43% <98.03%> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
obsplus/bank/wavebank.py	97.08% <ø> (-0.05%)	:arrow_down:
obsplus/utils/bank.py	95.85% <95.00%> (-0.17%)	:arrow_down:
obsplus/bank/eventbank.py	99.54% <100.00%> (+<0.01%)	:arrow_up:
obsplus/constants.py	100.00% <100.00%> (ø)
obsplus/events/get_events.py	95.37% <100.00%> (+0.52%)	:arrow_up:
obsplus/exceptions.py	100.00% <100.00%> (ø)
obsplus/utils/misc.py	98.32% <100.00%> (+0.05%)	:arrow_up:

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[d-chambers]

@sboltz mind giving this a quick look-over? The changes in codecov come from deleting code that was run but wasn't actually doing anything.