Add support to disable search feature.
Add search-enabled option for bootstrap theme.
Add tests for search enabled option.
Merge pull request #166 from jverghese/disable-search-option

Add support to disable search feature.
fix(groupBy): preserve groups in order of appearance
feat(multiple): support for multi-selection
Fix: multiple choices highlighted at same time
Fix: dropdown doesn't appear when pressing key down (just the word "true")
Remove items from dropdown that are already selected
Check formatter/parser (single property binding) to work correctly on "multiple" mode
Fix: when pressing a key on the input, the whole selected array is erased
Prevent already selected items to show when searching
Add bootstrap template
Improve margins between buttons at bootstrap theme
Fix input width calculation and avoid unnecesary digest
Change transinject for uisTranscludeAppend from #151
Merge pull request #171 from just-boris/master

fix(groupBy): preserve groups in order of appearance
Refactor/Clean code
Write tests
Add demo