Make Timestamp('now') equivalent to Timestamp.now() and Timestamp('today') equivalent to Timestamp.today() and pass tz to today().
Fix timedeltas to work with to_json
Clean up style a bit
Merge pull request #9028 from cpcloud/timedelta-json

Implement timedeltas for to_json
Merge branch 'timestamp-now' of https://github.com/rockg/pandas into rockg-timestamp-now

Conflicts:
	doc/source/whatsnew/v0.15.2.txt
COMPAT: dateutil fixups for 2.3 (GH9021, GH8639)