BUG: Fix to_datetime to properly deal with tz offsets #3944

Currently for certain formats of datetime strings, the tz offset will
just be ignored.
ENH: allow legend='reverse' in df.plot() GH6014
CLN: clear up some cython warnings
CLN: eliminate bootstrapping issue form generate_code.py
BLD/DOC: use jinja2 templates to allow make.py to build partial docs
BLD/DOC: add logic to sphinx conf.py to speedup processing
BLD/DOC: Add argparse to doc make.py to control building
TST: fix undefined variables hidden by unintended test method shadowing
Merge pull request #6179 from y-p/PR_fast_docs

BLD/DOC: Speed up doc building via jinja2 and conf.py logic
BLD: ipython_directive, handle non-ascii execution results
BLD/DOC: docs conf.py, force pandas to alwayd output utf8 on eall systems (win)
BLD/DOC: add latex_forced target to doc make.py
TST: buggy tests on sparc/debian platforms
Merge pull request #6191 from jreback/debian_fix

TST: buggy tests on sparc/debian platforms
TST: skip the get_quote_stringlist in TestYahoo....failing from network issues too much
DOC: contributing.rst, document fast doc building
Merge pull request #6193 from y-p/PR_contrib_fast_doc

DOC: contributing.rst, document fast doc building
BLD/TST: @network, inspect formatted expection rather then str(e)
Revert "TST: skip the get_quote_stringlist in TestYahoo....failing from network issues too much"

This reverts commit 0c938e600f5aaecc565ca945037dd8ef7160cf05.
Merge pull request #6192 from y-p/PR_network

BLD/TST: @network, inspect formatted expection rather then str(e)