added option 'messages' to autocomplete

messages is used to control accessability status messages using the the following structure

messages: {
    noResults: '',
    results: function() {}
}
Merge branch 'master' of https://github.com/a-sassermann/knockout-jqueryui into autocomplete-messages-option
Autocomplete has the 'messages' option only in jQuery UI >= 1.9
Modified jasmine-jsreporter because the SauceLabs tests failed with Chrome
Merge branch 'autocomplete-messages-option' into develop
Upgraded the devdependencies
Merge branch 'upgrade-devdependencies' into develop