Create support for additional jQuery placeholders

[EitanBlumin]

Declare values for additional AngularJS variables to be used as placeholders:

• [X] row['...'] (already implemented row-level palceholders)
• [X] {{this}} (current field value)
• [x] dataview[id]
• [x] dataview[title]
• [ ] dataview[...] (TBD)
• [x] urlparam[...] (Get parameter values from querystring)
• [ ] user[...] (User properties, once authentication module is implemented)

[EitanBlumin]

JQUERY instead of AngularJS. Placeholders would be usable in certain expressions:

• Dataview field URL
• Dataview field textual value (provided an appropriate flag is turned on)
• Back link path (filtering)
• Action expression (JavaScript function or DB command)
• More TBD

[EitanBlumin]

Placeholders for:

• [x] row fields {{row[field]}}
• [x] current column value {{this}}
• [x] dataview properties {{dataview[property]}}
• [x] dataview parameters {{filter[column]}}