Update plugins_disabled/omnifocus.rb

2 changes:

1st - ensure that only valid characters are saved from omnifocus.  
If a completed task contains a bullet, for example, the dayone.rb 
script will fail at content.scan on line 6 with the following error:
in `scan': invalid byte sequence in US-ASCII (ArgumentError)

2nd - added the ability to show the number of completed tasks for the day in the output file.
added option to create an entry for tweets retweeted.
Merge pull request #107 from blackader/master

Updates to fitbit plugin
Merge pull request #106 from juliengrimault/twitter-retweet

Added option in twitter logger to create an entry for retweeted tweets.
Merge pull request #102 from pdoak/patch-1

Update plugins_disabled/omnifocus.rb
updating fitbit plugin

Added optional sleep logging
Fixed water input showing long decimal values.