Address issue bin/audit-ci line-break in Linux environment

Changes made for this release: https://github.com/IBM/audit-ci/compare/v1.0.1..v1.0.2

• Packaged in a Linux environment to address: #13. Did not come up with a long-term solution to this, so for now will not package on Windows.
• Cache the Travis-CI build for quicker builds
• Updated README to suggest integrating as a dev-dependency