FIX: Enable non-zero exit code + correct logic in determining Nexus IQ policy warnings

[madpah]

Signed-off-by: Paul Horton phorton@sonatype.com

This PR primarily contains an update to allow jake to exit with code 1 when either:\

• OSS Index has reported vulnerabilities
• Nexus IQ has reported policy violations (FAIL)

This new functionality can also be overridden by adding the -w or --warn-only flag.

In addition an un-reported bug with the handling of results from Nexus IQ was noted and squashed (bad logic).

It relates to the following issue #s:

• Fixes #65

cc @bhamail / @DarthHater