Override the version and source of android-support-v4 to use the one from API 17.

We can restore this back to normal once Maven Central updates to the latest.
Use existing LocalMessage for the JB notifications.

LocalMessage already has a content preview in it; reuse that.
Remove unneeded MimeMessage#getPreview() method now that we don't need
to generate a preview anymore.
Add ckChangeLog to display a change log after an app upgrade
Improve notification message list processing

- If a message contained in the inbox list is deleted or read while
  there are messages in the overflow list, restore the newest message
  from the overflow list so there are always 5 messages in the inbox
  list in that case.
- Use explicit methods instead of method overriding.
Fix build.xml so Jenkins is happy again
Fix typo causing a NPE.
Some more cleanup

- When the last message of the message list is cleared, clear the whole
  notification
- Compare whole message reference, not only UID.
Documentation and cleanup

- Add Javadoc to new methods and classes
- Get rid of magic number
Merge pull request #223 from maniac103/jb-notifications-followup

Some follow-up fixes for the JB notifications
IntelliJ IDEA: Update android support version per e7964682564e7ea6049c6dee6b4e7f0a569564dc.
Add Maven pom for ckChangeLog.

Out IntelliJ IDEA project is using Maven for dependency management.
IntelliJ IDEA: Project updates to drag in ckChangeLog.
IntelliJ IDEA: Remove unnecessary "library" entry.
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  IntelliJ IDEA: Remove unnecessary "library" entry.
  IntelliJ IDEA: Project updates to drag in ckChangeLog.
  Add Maven pom for ckChangeLog.
  IntelliJ IDEA: Update android support version per e7964682564e7ea6049c6dee6b4e7f0a569564dc.
  Documentation and cleanup
  Some more cleanup
  Fix typo causing a NPE.
  Fix build.xml so Jenkins is happy again
  Improve notification message list processing
  Add ckChangeLog to display a change log after an app upgrade
  Use existing LocalMessage for the JB notifications.
  Override the version and source of android-support-v4 to use the one from API 17.
First pass at an overlay to display MessageList changes instantly.