client: rework page title

Remove "prototype" from the page title. Change the static `<title>`
to `StrongLoop Studio`.

Modify the generated `version.js`:
 - dynamically set document.title to "StrongLoop Studio Beta"
 - make the name displayed in the page consistent with the
   document.title, e.g. "StrongLoop Studio Beta 0.2.0"

See #381 

/to @seanbrookes please review
/cc @anthonyettinger