Add option to disable tty animation when watching files.

Netbeans and other tty's that don't support the full range of ansi escape sequences output the following when using the `-w` option:

````
  ◜ watching  ◠ watching  ◝ watching  ◞ watching  ◡ watching  ◟ watching  ◜ watching  ◠ watching  ◝ watching  ◞ watching  ◡ watching  ◟ watching  ◜ watching  ◠ watching  ◝ watching  ◞ watching  ◡ watching  ◟ watching  ◜ watching  ◠ watching  ◝ watching  ◞ watching  ◡ watching  ◟ watching  ◜ watching  ◠ watching  ◝ watching  ◞ watching  ◡ watching  ◟ watching  ◜ watching  ◠ watching  ◝ watching  ◞ watching  ◡ watching  ◟ watching  ◜ watching  ◠ watching  ◝ watching  ◞ watching  ◡ watching  ◟ watching  ◜ watching  ◠ watching  ◝ watching  ◞ watching  ◡ watching
````