2.3.rc1

We need your help to finalize the release -- please test this new version for both clean installations and upgrades, and report any issues.

Note that there are some slight changes to the installation and upgrading procedures, so please test these documents by following their instructions to the letter, and report any problems.

New and changed features

• Numerous bug fixes
• You can select to group todos on the home page by context or by
  project (using the view menu). This also works for tag page, the
  project page, the tickler and the context page
• You can now change the state of a context to closed
• Czech locale has been renamed from cz to cs to follow ISO standards
• Added Russian locale (@AlexStein)
• The toggle-notes and toggle-collapsed-containers have been moved into
  the view menu.
• The environment must now be specified during asset precompilation.
• Tracks is tested on Ruby 1.9.3, 2.0.0, and 2.1

Removed features

• Ruby 1.8.x is no longer supported

Under the hood

• Upgraded Rails to 4.1
• Several refactorings for easier maintenance