Fix two bugs when filterIgnoreCase is false
Fix two bugs when filterIgnoreCase is false

1. When fillOnBlur is false, matching that occurs when Enter is pressed
ignores case.
2. Invalid value checks ignore case.

See http://jsfiddle.net/gjsjohnmurray/ntge0beb/

ivkremer/jquery-simple-combobox,ivkremer/jquery-simple-combobox