added function to update CMS fields
Merge pull request #168 from phptek/issue/163

BUG: Fixes #163 User unable to select pending workflow instances with the "edit" icon
Merge pull request #172 from phptek/issue/165

FIX: Fixes #165 Inclusion of 'Draft' items in PendingItems GridField.
Merge pull request #159 from dnadesign/UpdateCMSFieldsWorkflowDefinition

added function to update CMS fields
Tests fail when the Translatable module is installed.