JS Style Guide: Add rules for constructor invocation

Ref https://github.com/jquery/jquery/pull/1856#issuecomment-65346516

These reflect my personal preference for explicit clarity (especially around whitespace-preceding keyword operators) and could easily be changed; I just want to get some clear guidelines published.
Aren't those considered literal notations instead of constructors?
`new Array()`, etc. should fall into this category though, for consistency.