Use simplejson if avail & do not sort keys unless debugging
Change deepcopy to shallow dict copy.

The deep copy operation is very expensive; particle generation performance is
30% faster with this one change.

It's also unecessary because all values in self.contents are immutable, hence
it's impossible for a change to the copy to affect the original.

If there were a mutable object in self.contents, then the above may no longer
be true.
eliminate expensive test
Removed cruft

Those lines had no effect.
More yaml load fixes and some cleanup
Merge pull request #90 from sfoley/master

Another preventative fix...last one?
Merge pull request #85 from n1ywb/driver_perf

Instrument Driver Performance Enhancements
Merge branch 'master' of https://github.com/ooici/marine-integrations