Use passive voice in release notes

While trying to avoid active voice in release notes, all points
have been written as small clauses with no subjects. As a
result, some points do not sound right. Make them sound right by
rewriting them in passive voice which have a subject.
Update version to 1.0-beta3

Make the following changes to update version to 1.0-beta3.
  1. Set Version.VERSION = '1.0-beta3'.
  2. Update development release to QuickQWERTY 1.0-beta3 in download
     page.
  3. Update development release date to 2013-09-28 in download page.