move themes code into OpenProject's library
fix a wrong css class regarding themes
refactor themes backend
* extract theme finding code from the Theme class into a ThemeFinder module
* omit a trailing 'Theme' in the class name for default identifier and name attributes of themes
* remove the default? method
* do not rely on AS::DescendantsTracker anymore, although it was nice
refactor watchers helper to return html_safe html
make gravatar helper html_safe when no gravatar is shown
add cukes for adding/removing watchers in issue#show
update changelog
Merge pull request #237 from opf/feature/rails3_repair_changing_issue_watchers

Feature/rails3 repair changing issue watchers
let's call the default theme 'OpenProject'. alternatively one could have changed the class DefaultTheme to OpenProjectTheme and let that be the default theme.
changed resued password wording to one that is a little less complex and a little more polite
Fix 'previous' pagination label.
Swap priority of session param and options param.

The options param should have a higher priority. Otherwise the 'page per param' setting
cannot be changed anymore by the user as soon as a session value is present.
Add test.
Password reused warning: Improve singular

[skip ci]
Merge pull request #238 from opf/fix/reused_password_wording

changed reused password wording ...
Remove (hopefully) superfluous TODOs

[ci skip]
Merge pull request #230 from opf/feature/rails3-themes-refactoring

Refactoring of Themes Backend
Add changelog entry.
Merge pull request #241 from opf/feature/rails3-fix-pagination

[OPF#1214] Fix pagination
Add settings for brute force prevention