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Pull #351

travis-ci

Replace cov-core with coverage plugin

cov-core has been unmaintained for 3 years, but the coverage project (
https://pypi.python.org/pypi/coverage ) is getting active work as of
2017.
Closes #336

Notes:
- `coverage` supports all of the reporting modes of `cov-core`, but
  how do we verify that they all work the same in all cases...?
- Still allows "term-missing" to get "show_missing" behavior, to be
  backwards compatible, but otherwise will rely on coveragerc
  specification of "show_missing"
- `coverage` matches the plugin module name, so for py2 to work it
  needs a future import of `absolute_import`
- `coverage` doesn't accept reporting modes as an argument, but
  requires explicit calls to its reporting methods, so imitate the
  same dispatch that we got under `cov-core`
- `cov-core` was running between plugin initialization and
  `createdTestSuite` getting called. It's not obvious from docs
  whether or not `coverage` supports multiple start/stop calls before
  reporting, so I've removed this. Was having coverage measurement
  during this period important?

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