comparisons for: status, type, responsible.

contains some bugfixes too.
changelog.
make every attribute comparable.

for now: add project.
tests for time comparisons.
Merge remote-tracking branch 'origin/feature/rails3' into feature/magic_comparison

Conflicts:
	app/assets/javascripts/timelines.js
	app/views/timelines/_timeline.html.erb
	doc/CHANGELOG.md
changelog added. sorted.
Merge remote-tracking branch 'origin/feature/rails3' into feature/magic_comparison
bugfix. rename some due dates.
get timeline rows and cells. test status.
Merge remote-tracking branch 'origin/feature/rails3' into feature/magic_comparison

Conflicts:
	doc/CHANGELOG.md
add assignee column.
new changelog.
Merge remote-tracking branch 'origin/feature/rails3' into feature/magic_comparison

Conflicts:
	doc/CHANGELOG.md
Merge pull request #513 from opf/feature/magic_comparison