Updated DefaultPrefs.json
v0.0.1.28

-Resetting the default extensions is now done with one url request
instead of several.
-Files that start with a dot are no longer ignored by default. There are
some movies that start with a dot.
-There is now an option to ignore files that start with a dot in the
Prefs.
-Added .plexignore to the default ignored files.
Merge pull request #64 from srazer/master

v0.0.1.28