[DDF-456] Switch to slf4j
Merge pull request #7 from bradh/DDF-456

[DDF-456] Switch to slf4j
Reviewed by: @shaundmorris & @mrmateo
DDF-199: Added a Content Disposition header to the response to format the filename as <DDF_Sitename>_<Start_Date>_<End_Date>
DDF-199: Added a Content Disposition header to the response to format the filename as <DDF_Sitename>_<Start_Date>_<End_Date>. Updated unit tests.
DDF-199: Cleanup from merge.
Also updated some of the logging.
DDF-199: Updated MetricsEndpointTest.java
DDF-199: Removed duplicate service reference.
Merge pull request #8 from mrmateo/ddf199

DDF-199: Adding Content Disposition header to response.
[DDF-180] Reduce System.out.println usage
Merge pull request #10 from bradh/DDF-180

[DDF-180] Reduce System.out.println usage
DDF-458: Updated to build on JDK7 and JDK8.
[DDF-466] Move EnvList command from ddf-catalog to ddf-platform
[DDF-466] Reorder commands to fix travis-ci breakage
[DDF-466] Change prefix from ddfplatform to platform
Merge pull request #9 from bradh/DDF-466

[DDF-466] Move EnvList command from ddf-catalog to ddf-platform
DDF-460  implementation of persisted notifications using Hazelcast
DDF-460  removed unused log4j dependencies
DDF-467: add "describe" command for ddf-platform
DDF-467: output configuration variables sorted by key

This change by special request for Mr. Mateo.
DDF-460  added closing of file streams