SPFofm validations bug fixes

- Fix validation errors in `spfieldNumber` and `spfieldCurrency`
- Add two new properties to the directive object definition. See
`baseLinkFn` in the `SPFieldDirective` service for more details.
Conflicts solved
SPForm improvements

- Now the item is synced with the parent scope, usually a controller.
- Added processing of class attribute in spfield directive wrapper.
- Added processing of label attribute in spfield directive that is
propagated to spfieldLabel directive.
SPForm improvements (Conflicts resolved)

- Discarded changes in build files
SPForm improvements bug fixes

- Clean copy of the item to originalItem.
Merge remote-tracking branch 'origin/PCASME'
Merge branch 'master' into Pau