Use var.CWD so that Lighty runs from the project root

No matter where the project root lives.
Bump to CocoaPods v0.23.0
Launch Lighty in the background as a user process
Look for Lighty at /usr/local/sbin

PATH does not contain /usr/local/sbin, by default.
Merge branch 'feature/fix_travis_ci' into develop
Remove launch daemon artifacts

Travis launches Lighty as a background user process.
Requires iOS 6.1 or above

README now matches Pod specification.
Merge pull request #3 from royratcliffe/develop

Fixes Travis CI Builds