Added explicit error message for missing configuration arguments.
noteboook with spaces.ipynb test
updated test for spaces in filename
use notebook which has an image in it for the test
use grffile to support notebooks with spaces
add grffile to the basic latex template
added check_for_tornado, closes #3916

This way, those relying on the output of `python setup.py install` get
clued in about the fact that it is required for the notebook
Merge pull request #3918 from ivanov/fix-3916

added check_for_tornado

closes #3916
Merge pull request #3913 from ivanov/alt-fix-3774

use grffile to support spaces in notebook names

closes #3774
closes #3898
Merge pull request #3910 from dhirschfeld/config-error

Added explicit error message for bad connection files.
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
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.
Add coalesce streams test
Renamed build notebook funct so nose test doesn't run it
Added base transformers test class and added CSSHTMLHeaderTransformer tests
Inlining is not an attribute of resources
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