Remove with_context decorators
Merge branch 'issue-query-perf-improvements' of https://github.com/PyBossa/pybossa into issue-query-perf-improvements

* 'issue-query-perf-improvements' of https://github.com/PyBossa/pybossa:
  do task_run also with SQL
Only query for needed fields
Merge branch 'issue-query-perf-improvements' of https://github.com/PyBossa/pybossa into issue-query-perf-improvements

* 'issue-query-perf-improvements' of https://github.com/PyBossa/pybossa:
  Fix number
  Use a SQL query for getting the task_browse page in cache.
  move return into try section

Conflicts:
	pybossa/cache/apps.py
Remove unused function
Added test cases