Updates translation template.

Updates build file to skip build and dist directories when updating POT
file.
Switches tasks to Rake.
Updates screenshots. Fixes #47.
Ignore build dir.
Fixed broken image links. Resolves #47
Be defensive on displaying the query. Fixes #58

I can't reproduce this, so I'm just going to harden the code somewhat.
Updated the release checklist.
After editing the search, redirect to the right place. Fixes #59.
Reformatted Rakefile.
Set version to 2.0.4.
Updated language files.
Merge branch 'release/2.0.4'