Added working speaker notes for slides.
Fixing docs.
Fixing info in trailets.
Fixing names for aliases.
Fixed trailets help.
Drop 2.6 and 3.2 from Travis tests
Remove extra assert methods needed for Python 2.6
Update docs for Python version support
Drop nested() function for context managers
Remove _total_seconds helper function
Remove Python 2.6 workaround
remove workaround for 2.6 support
Fixed doc about using PR-related aliases.
irunner use python -m IPython to launch subprocess with matching interpreter

Closes gh-4013
small doc fix in nbconvert
bson.Binary moved

for mongodb task backend
don't close_fds on Windows

straggler missed in 14b007d

closes #3244 (again)
Fixed custom jinja2 templates being ignored when setting template_path
needed proper dict syntax
prepend :meth: Docstrings are not markdown.