Guard for votes without propositions in the search results.
Fix for empty propositions
Bump selenium-webdriver to 2.30, which supports Firefox 19.
Replace topics with tags. Closes #408.
Fix tabs to spaces.
Fix issues#index for tags.
Merge branch 'master' of github.com:holderdeord/hdo-site into 369_fix_relation_indexing

Conflicts:
	spec/search/issue_search_spec.rb
Remove topic index update and spec (topics are dead).