Make outer quote text object pick next whitespace

There was an inconsistency with Vim: `a"` there actually selects the
quotes plus any extra whitespace to the right of the quotes. Instead
`2i"` should be used to select everything - including the quotes - but
nothing extra.

Related to #522.
Merge pull request #530 from albertdev/select-all-quote-and-whitespace

Make outer quote text object include next whitespace