fix(stage-copy): cwd expand file options not copying to stage directory

Closes #10
fix(README): fixed readme file definitions to reflect use of cwd with expand

Closes #11
chore(travis): run tests on Travis-CI

PR #10 generously added a nice test suite. It might change in the future (admittedly,
probably not), but it's certainly a good start, and running tests on Travis will help
me be confident in merging patches.

Of course it's not at all an exhaustive suite, this should be improved over time. But
it's not bad.

Closes #13
docs(README): add Travis-CI badge

Closes #14
docs(README): use SVG Travis-CI badge, not PNG
chore(npmignore): add tests and node_modules to npmignore

I'm going to publish this stuff today, since apparently I haven't done that...

Closes #16