Transforms "+" characters to "%20"

[sstarrAtmeta]

If a string with +characters is supplied to represent a space then output will replace these with %20

Expressed in test form below

it('Uses + for spaces if part of supplied', function(){
  var originalLink = 'http://www.example.com/example.html?var=a+b';
  var u = new Uri( originalLink );
  assert.equal( u.toString(), originalLink)
})

Use case: one of our uses for jsUri is to make a "prettified" compact version of user-supplied link by stripping out information extraneous to display such as ( but not limited to ) protocol. Re-encoding the space characters with a different symbol can be confusing.