formRenderComplete event

ngSharePoint:
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- Implemented the 'formRenderComplete' event.
- Implemented method 'updateProperties' in the SPList factory.
- Bug fix in 'spfieldAttachments'. Solved page reload on remove an
attachment.
- Bug fix in 'spfieldControl' with the 'required' attribute.
- Bug fix in 'spfieldUrl' validation.
- Bug fix in 'spfieldUrl' template. Duplicated decription input ¿?
- Bug fix in 'spform' when adds the Attachments field.
- Bug fix in 'spform' when extend the fields schema with the
extendedSchema.

ngSharePointFormPage:
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- Implemented 'useControllerAsSyntax'.
- Implemented the parse of '~site' token in the formDefinition.