Fix, don't try to create '' directories
Make sure that a notebook_name is provided if writing to the filesystem
Allow for files output without an extension
Fixed call to pretty print.
pprint is the import function, not module
Fixed output to match other print statements
Fixed, should only be called if enabled
figure renamed to output
s/a/an
FIX Coalesce streams transformer, missing assignment to `last`
s/AttributeError/TypeError
s/figure/output
replace --pylab flag with --matplotlib in usage

Since we want to encourage users to start switching to this mode of
working, we might as well advertise it (and *not* advertise the old
namespace polluting --pylab)
document the --matplotlib flag
backticks don't need to be escaped
Merge pull request #3925 from ivanov/more-pylab-cleanup

Replace --pylab flag with --matplotlib in usage

also some other cleanup in what's new
swallow enter event in rename dialog

avoids adding newline in cell after dialog is closed.

closes #3926
Merge pull request #3924 from jdfreder/backport_fixes

nbconvert: Backport fixes

cherry-picked from #3914 and #3923, which include tests that will not be merged into 1.0.
Merge pull request #3929 from minrk/rename-cr

swallow enter event in rename dialog

avoids adding newline in cell after dialog is closed.

closes #3926
FIXED logic of verbose flag in PDF post processor
Merge pull request #3934 from jdfreder/backport_fixes2

nbconvert: fix logic of verbose flag in PDF post processor