Fix summary calculating for dynamic columns
Add spec for summary calculation
Merge branch 'master' into issue/fix-summary-for-dynamic-columns

Conflicts:
	spec/mongoid/report/summary_spec.rb
Merge branch 'master' into issue/fix-summary-for-dynamic-columns
Merge pull request #2 from oivoodoo/issue/fix-summary-for-dynamic-columns

Fix summary calculating for dynamic columns