* master:
  wendelin.core v0.13
  tox -= Python3.5
  Fix build for Python 3.7
  tox: ZODB5.test.util needs mock
  tox: v↑ NumPy to 2 latest releases
  bigfile/zodb: Resync _ZBigFileH to Connection.transaction_manager on every connection reopen
  t/qemu-runlinux: Issue terminal init before running program
  t/qemu-runlinux: Kernel verbosity control via -v

Let's keep on test coverage for last 2 stable Python releases.

Starting from Python 3.7 the place to keep exception state was changed:
https://github.com/python/cpython/commit/ae3087c638

NOTE ZEO4 does not wok with Python3.7, because ZEO4 uses "async" for a
variable and that breaks because starting from Python3.7 "async" became
a keyword.

After the fix wendelin.core tests pass under all python2.7, python3.6
and python3.7.