extracted the Watcher to an Interface.
Implemented a second watcher that uses the old polling way of checking files.
Removed old stuff from the PollingWatcher.
Divided the main program in two parts:
- reading the files as provided and dumping the output to screen
- following the files when -f is applied.
Merge branch 'master' of git+ssh://github.com/maartenl/jtail
Made small changes to readme file.