Merge branch 'release/4.1.2' into develop
Update Travis config file.

Add support to run spec tests on the develop branch.
Allow tools to report version to vCenter.

Allow for setting the disable-tools-version to true or false in the
/etc/vmware-tools/tools.conf file.  This allows the tools to report
their version back to vCenter or the ESX host console.  Issue #8.
Merge branch 'feature/disable_tools_version' into develop
Update README.md

Added develop branch Travis Build Status image.
Added links to the GitHub and Puppet Forge software locations.
Added DEVELOP.md.
Update versions for 4.2.0 release.
Merge branch 'release/4.2.0'