Fixed the Recursion Bug in ImportErrorObject

Works on the command line and in the tests!
Website: Direct the "Edit on GitHub" page to the ioam repository
Merge pull request #518 from ioam/recursion_bug

Fixed the Recursion Bug in ImportErrorObject
Only apply scaling in HomeostaticResponse if slope is nonzero, both for numerical accuracy and as an optimization.  Contributed by Marwan Jabri.
Added ALERT
Fixed pyflakes warnings
Fixed previous commit to restore API import and label it appropriately
Minor formatting fix
Restore flags in measure_response fixed and function called correctly for measurement
Fixed incorrect assignment of SheetView attributes during measurement
CFProjection get_view method uses current simulation time if timestamp not provided
Merge branch 'master' into pjfranalysis