Fix for tests
Added functions for # of completed tasks and volunteers to cached apps
Missing function parameters
Pass number of volunteers and completed tasks for apps to be shown in home/index template
Updated default-theme submodule reference.
Merge pull request #741 from PyBossa/update-default-theme-submodule-ref

Updated default-theme submodule reference.
Updated redis cookbook submodule ref.
Use master default-theme branch for now
Merge branch 'master' into issue-687-app-blogs

* master:
  Updated default-theme submodule reference.
  use merged master pybossa theme submodule now. Fixes #735
  Use master branch theme
  Refactor: added setup_db function
  Added app reference to SQLAlchemy DB instance. Fixes #736, fixes #737
  fix some small documentation errors
  Fixes #733
  Fixing Shuttleworth funded logo
Updated submodule ref for default-theme. Includes new blog templates
Updated default-theme submodule ref to master after merge on it
Merge pull request #730 from PyBossa/issue-687-app-blogs

Issue 687 app blogs
Pass number of volunteers and completed tasks to app index, app details and app tasks templates
Test skeleton for cached apps and converted test_cache into package
Missing Copyright in file
Tests for n_completed_tasks
Removed print
Tests for n_registered_volunteers
Tests for n_anonymous_volunteers
Tests for n_volunteers