Update README.markdown
Bring up to parity w/ Cap v2.15.5

Important functionality w/ regards to some variables, and especially the
`run_locally` method. Ensures if local commands exit non-zero, that they
abort the deployment, as they should.
Bump to v.1.1.3
Merge pull request #25 from jeffbyrnes/master

Bring deploy code up to parity w/ Capistrano 2.15.5