Updated Travis icon and readme description

- Updated Travis CI icon to show status of this fork
- Updated README with brief description what is this fork about
Merge branch 'feature-keep_secret' of https://github.com/stepanstipl/puppetlabs-inifile
Initial 0.1.0 release, adds support for keep_secret
Sync to upstream
Version update to reflect upstream
Merge branch 'feature-keep_secret'
Synced with feature-keep_secret branch and updated travis.yml to run tests on this branch too
Fixed some typos in unit tests