Changed tol on Complex and Real field to None

Fixes simplification issue #7263. Added test to check issue in
test_simplify.
Fixed travis errors

Direct comparison of expressions lacks enough precision for ==.
Comparing numerically now with evalf().
Changed test to check abs(output - answer) < 1e-15
Merge pull request #7360 from jcrist/issue7263

Changed tol on Complex and Real field to None