Add property colDefault to fieldInfo object, set its true if there is
orm configuration default `orm:"default(1)"`
Add attribute DEFAULT '' to the CREAT, ALTER constructors
Fix undefind variable fieldType
Fix function name fmt.Stprintf -> fmt.Sprintf
Fix comma in the switch, fix wronf function name
Merge pull request #870 from supar/add-column-default-attribute

Add column default attribute
Revert "Add column default attribute"
Merge pull request #881 from astaxie/revert-870-add-column-default-attribute

Revert "Add column default attribute"