window.$ may not be defined so use window.jQuery

In some environments (eg WordPress) window.$ not defined so use window.jQuery
Hide when tabbing off the input.

Cater for someone tabbing off the input by listening for "focusin" as well as "click" on the document, same event handler.
Show clock on click in input as well as on focus.

Just adds click listener as well as focus listener to input, same event handler (this.show). Gives similar behaviour to that of jquery.ui.datepicker. See also 3DFace issue https://github.com/weareoutman/clockpicker/issues/6#issue-33575185
Reset some .popover > .arrow properties (WP clash)

Reset some ".popover > .arrow" properties that are set in WordPress admin (via ".arrow" in "wp-admin/css/revisions.css").
Check align makes sense re placement.

Make sure arrow alignment makes sense in relation to popover placement.
Merge pull request #5 from gitlost/master

window.$ may not be defined so use window.jQuery