Mock Pandas Timestamp now/utcnow/today methods #426
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Patch to solve #298. Freeze_time patches the pandas Timestamp, now, utcnow, and today methods if pandas is available on the system (i.e. an import pandas call does not fail) and has no effect if pandas is not installed.
The mocks are generated by wrapping the equivalent calls from FakeDatetime in a Timestamp constructor, so ticking/etc. functionality from the original class should flow directly. However, the mocked return value of Timestamp.now, Timestamp.today, and Timestamp.utcnow is currently Timestamp, but not FakeDatetime. If the latter is necessary (e.g. if it's contracted that any freezegun'd value is always a FakeDate/FakeDatetime) I can revise the PR.