Add specs and .travis.yml

[erran-r7]

Fixes #108 /cc @gschneider-r7

• Create .travis.yml
• Get someone with admin access to rapid7/nexpose-client configure TravisCI's web hook.
• Add specs
  • Scaffold the specs directory with a basic spec_helper
  • Define at least one spec
  • Define unit specs
  • Define integration specs
    • which tests the directly against Nexpose API
    • which tests using fixtures that can be anonymized and uploaded to GitHub

[erran-r7]

Check out the pull request at erran#1 which demonstrates TravisCI's GitHub integration on my fork of nexpose-client.

[erran-r7]

@mdaines-r7 Merging this PR into master. We can continue building out the issues but this adds a decent amount of tests and a good boilerplate for adding more.

[mdaines-r7]

Cool, I was crunched for time earlier and couldn't merge the PR.

One other thing to add to the list above is to do some coverage metrics. They can be a good guide into what we might be missing (provided there isn't some arbitrary goal set).

[erran-r7]

We've used simplecov in other projects under @rapid7 internally. Since this is an open source project maybe we can utilize Code Climate (which the Metasploit team uses): https://codeclimate.com/github/rapid7