check exit code for ED, don't change folder (breaks relative paths)
Merge branch 'master' of github.com:PecanProject/pecan
Fix for github issue #23 - sensitivity.analysis start/end date
default to the run's start/end if not explicitly passed.
fix problem with offline site remembering #19
Merge branch 'master' of git://github.com/PecanProject/pecan into github_23
Fixed typo in last commit where start.date should've been end.date