DW: returns a json response on error
DW: Added a check for a template before report generation, updated the documentation on xls reports, updated and added tests
DW: Concatinating string using format instead of using +
Merge pull request #694 from onaio/690_return_json_object_in_xls_report

Checks for a external export template
DW:ME Made the close icon working and annonymous users cannot view the edit and delete button