SPFormToolbar

- Implemented automated spform-toolbar directive
- Implemented spform-toolbar-action directive
- Implemented sp-action attribute directive
SPRibbon

- Implemented SPRibbon service
- Updated spformToolbar directive
- Updated spformToolbarAction directive
- Updated spAction directive
- Updated spfieldAttachments directive
SPRibbon bug fixes

- Solved the double compilation of the 'spformToolbarButton' directive.
- Changed the behavior  of the 'show-in-ribbon' attribute in the
'spformToolbar', 'spformToolbarButton' and 'spAction' directives. Now
only takes effect when the attribute is present and its value is 'true'.
SPRibbon code cleaned up

- Removed unnecessary dependences in 'spform' directive.
Merge remote-tracking branch 'origin/PCASME'