feat(jqLite): implement jqLite(f) as alias to jqLite(document).ready(f)

jQuery has supported this form for a long time. As of jQuery 3.0 this form is
the preferred one and all others are deprecated so jqLite(f) is now also
supported.

All internal invocations of jqLite(document).ready(f) (& equivalent) have been
replaced by jqLite(f).

Tests for these methods have been added as jqLite#ready had no explicit tests
so far.