enable retina matplotlib figures
enable retina display of Image objects

only works for embedded images
test Image(retina=True)
make sure test files are installed
Add Condor bindings for IPython.parallel
fix typo, closes #3462

Thanks to github user @gaulinmp for submitting a bug report and the
suggested fix.
regexp group in BatchLauncher, no Condor -verbose

Previously I used condor_submit -verbose so that I could pull the job id
from the first line. However, when submitting many jobs it's silly to
have to search through some many lines of output. Now we have a regexp
for Condor that matches on the non-verbose output. Here the job_id is on
the end of the output, so using grouping in our job_id_regexp becomes
very useful. To account for this I have added a job_id_regexp_group
property to the BatchLauncher and it's subclasses. The default of 0
means the whole regexp is matched - however now an integer can be passed
in here to instead select a subgroup of the expression (see
CondorLauncher and the mechanism will be clear).
Tided up queue configuration(no support in Condor)
Merge branch 'master' into htcondor
remove debug print statements
removed noop start methods on EngineSetLaunchers
Kernel fails to start when username has non-ascii characters
launch ipcontroller, added documentation
Cleaned up doc on CondorLauncher
fixed typo
add Condor launcher tests
add Condor to docs in ipclusterapp
rename Condor -> HTCondor in all instances
Merge pull request #3463 from ivanov/fix-3462

fix typo, closes #3462

Thanks to github user @gaulinmp for submitting a bug report and the
suggested fix.
pass config to subapps

closes #3473