Prevent chosen-drop elem from appearing when empty

Without this, the chosen-drop elem will appear as an empty white box with a shadow
Add instructions to install dependencies
Merge pull request #1443 from fourcolors/patch-2

Add instructions to install dependencies
Apply empty chosen-drop check to prototype version

(Prevent chosen-drop elem from appearing when empty)
Initialize results_all_chosen without assuming results

Otherwise, empty selects will still show empty chosen_drop elems when focused
No longer rely on the DOM to deselect last selection

When choosing an option in a single select, we need to update the
array of options to deselect any previously selected options.
result_single_selected is no longer used
Move some repeated logic into abstract chosen
Make sure selected items are cleared after resetting Chosen single
Remove superfluous variable update
Update our policy on bug reporting

fixed typo

Another typo
Merge pull request #1470 from harvesthq/closing_issue_policy

Update our policy on bug reporting
Merge pull request #1461 from harvesthq/g1458-fix-single-selected-result

Single select results in sync
Docs should state that we (maintainers) will reopen issues.
Merge pull request #1501 from harvesthq/reopen_issue_policy

Docs should state that we (maintainers) will reopen issues.
fixed typo (originial => original), only test for existence of originalEvent once
Added missing curly brackets in example
Fixed invalid html
Display current version in docs' header. Update via grunt task
(dom_munger)
Merge pull request #1547 from harvesthq/fix_example_in_docs

Added missing curly brackets in example