Add helper for table sorting by column.
Add helper for table sorting by column.

renderedtext/base-app,codeclimate-test/base-app,tycoool/QADemo,sammarcus/base-app,sammarcus/base-app,mfolsom/therafinder,tycoool/QADemo,andjosh/invoiceapp,codeclimate-test/base-app,andjosh/invoiceapp,mfolsom/therafinder,codeclimate-test/base-app,geremih/recollab,geremih/recollab,sammarcus/base-app,renderedtext/base-app