Rename test_numerically to verify_numerically.  The name
'test_numerically' was confusing to py.test and caused strange 'fixture' errors.
Make --slow option with py.test _only_ tests slow tests
Merge pull request #8100 from pbrady/test_numerically

Rename test_numerically to verify_numerically for py.test compatibility
Merge pull request #8101 from pbrady/pytest_only_slow

Make --slow option for py.test consistent with bin/test usage
Ensure that theano are not run under py.test if theano is not installed
replace is with == comparison
reformat comments
additional bounded -> finite changes
add docstring to as_dummy()
sort when prining tree; unSKIP doctest
only print non-None keys
use two symbols
Merge pull request #8113 from smichr/bound2

additional bounded -> finite changes
Merge pull request #8110 from pbrady/pytest_theano

Ensure that theano tests are not run under py.test if theano is not installed
Merge pull request #8111 from pbrady/test_sympify_mpmath

Fix broken test::test_sympify_mpmath
do not use foo < 0 if foo can be symbolic
Merge pull request #8119 from smichr/bound2

do not use < if arg might be symbolic
remove --slow option from py.test as it is not the appropriate way to use py.test
use setup_module function to ensure pytest skips tests that have been
marked with 'disabled = True'
Removes mechanics printing deprecation warning. Fixes issue #7913.