Add ack-next-file, ack-previous-file to jump between files in ack buffer.
Changed default binding for moving pages.
Documented new functions.
Workaround for ack-next-file at buffer start.
#14: Follow header conventions.
Bump copyright year.
Declare as stable version 1.0.
Add configuration for travis-ci.
Add README with build status.
Update travis-ci configuration to use elisp-lint.el.
Fix indentation.