Merge pull request #37 from davidmsantos90/master

[CDA-57]: dataAccess list in the Previewer is sorted alphabetically
Merge pull request #38 from davidmsantos90/master

[CDA-61]: Fixed DataAccess type set in cache key
Fix exporting to CSV for null values in data
Merge pull request #39 from RuckusWirelessIL/master

Fix exporting to CSV for null values in data
[CDA-57]: Unit test for dataAccessMapToTableModel method