Add 'digest_timeline' option to twitterlogger.

If true (default), use current behaviour (ie digest of all tweets since
last run). If false, creates a new DayOne entry per tweet.
fixed issues with unit system and uninitialized oauth stuff
Merge pull request #237 from drallgood/fitbit

fixed issues with unit system and uninitialized oauth stuff
Update README.md

Deleted typo and added Apple developer download link for command line tools.
Merge pull request #243 from larryhynes/patch-3

Update README.md
Merge pull request #223 from randomphrase/twitter-nodigest

Add 'digest_timeline' option to twitterlogger.
Get goodreads working again by using the new feed format
Merge pull request #249 from BrettBukowski/goodreads-fix

Get goodreads working again by using the new feed format
Don't save blank twitter entries for timeline and faves (fixes #246)
Merge pull request #251 from BrettBukowski/fix-twitter-blank-entries

Don't save blank twitter entries for timeline and faves (fixes #246)
default to digest on first Twitter run
Merge conflict