Fixed bug where non-breaking space breaks the spelling plugin.

Example type following:
sourcebuzz  sourcebuzz

(note the two space between two words).
In IE8, the first misspelling won't be identified
because of an unencoded 0xA0 character is added
after the first word (it becomes
"sourcebuzz[0xA0][0x20]sourcebuzz"). Other
browsers correctly encode 0xA0 as &nbsp; therefore
the spellchecker detect the word correctly.

Solution:
add the 0xA0 character into the _getSeparators() function.
changelog for Fixed bug where non-breaking space breaks the spelling plugin.