Fixed errors with packages, modifiers and imports
Merge branch 'develop' into 4.5.4
Fix location of dataset in NCSS XML.

The location coming back was the path on the disk. On the NCSS side, the
path was being overridden for the form, but not the XML. This fixes
that.
Fixed failure in GridDatasetInfo.writeGrid() when grid has no description
* This was causing NCSS to fail when displaying the dataset.html form.
* Improved reporting of exceptions in NCSS. This should make it easier to find other bugs.
Fixed CompositeStationFeature.subset() bug.
* This was causing NCSS to return observations outside of specified date range from some feature collections.
Fixed NcssShowDatasetInfoImpl conflict.
Simplifying NetCDF-4 library loading (1)
* Code is mostly done. Working on docs.
Merge pull request #80 from michogar/4.5.4

Fixed some minor errors
Fixed error in NCSS grid writer when lat/lon axis is decreasing.
Merge branch '4.5.4' of https://github.com/Unidata/thredds into 4.5.4
Merge pull request #81 from dopplershift/cors

Implement simple filter for enabling CORS headers.
Add configuration of Cross-Origin Resource Sharing.

Hook up Spring so that the CORS filter can access configuration
information in threddsConfig.xml. This allows controlling CORS from
our standard configuration files.