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travis-ci

Bugfix for python3, enable python3 on travis-ci

Python3 is more strict about not allowing a loop over keys to be modified
inplace. Copy the key list prior to starting a loop when we need to delete
items.

Enable linux-python3 testing on travis-ci.

Testing:
  python2 unit tests - pass
  python3 unit tests - pass
  python2 manual testing checkout, checkout status - ok
  python3 manual testing checkout, checkout status - ok

104 of 288 branches covered (36.11%)

Branch coverage included in aggregate %.

406 of 835 relevant lines covered (48.62%)

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