Add npm test command.

This would make it easier to set up travis. Tests fail right now
because a test_numbers.txt file is referenced but does not exist.
Merge pull request #39 from tmcw/test-script

Add npm test command
Changes default directory to "."
Bump to 0.2.10.
Updates default path for bin/replace.js as well.
Merge branch 'bugfix/default-dir' of github.com:jeremyckahn/replace into bugfix/default-dir