Added CountPoints operation to count number of points per cell.
Preventing a loop from happening if an operation error has a format string in it.\n\nAlso fixed error message in Extent parsing.
Fixed issue with cacheAll in Catalog.

Closes #422
Clarified combine error messages.

Closes #413
Rename application.conf to reference.conf

Closes #432
Merge pull request #430 from lossyrob/bug/cacheAll

Fixed issue with cacheAll in Catalog.
Merge pull request #426 from lossyrob/op/countpoints

Added CountPoints operation to count number of points per cell.
Merge pull request #429 from lossyrob/bug/preventLoop

Preventing a loop from happening if an operation error has a format stri...
Merge pull request #431 from lossyrob/bug/413-AddErrorMessage

Clarified combine error messages.