Merge pull request Comcast#91 from alextarasov1/comment-corrections

fixed comment/spelling mistakes.

psi: ReadPMT skips over packets without a program map table (Comcast#85)

Remove release tag requirement (Comcast#89)

* updated travis to test with multiple versions of go and to create prereleases

* added missing semicolon

* quote go versions

* correct cli directory reference

* re-added accidental deletion

* remove tag requirement for release