Merge pull request #7 from smblott-github/execvp

Alternative (direct) execvp interface.
Merge pull request #8 from smblott-github/execvp

Bump version number -> npm publish extended API
Full bump of version number, changelog.
Merge pull request #9 from smblott-github/execvp

Full bump of version number; changelog.
Merge remote-tracking branch 'upstream/master'