By creating the ol3 map div in the html, there is no need any
more to wait for the custom GMaps control to append the ol3 map
to its parent. This also fixes an issue that sometimes prevented
the ol3 map to appear, when the GMaps tiles were loaded before
the custom control's div was appended to its parent.
This reverts 4d619d71b1 (see #1527), going back to what we had after e13075f6ff (see #881).
To avoid the 404 in the hosted examples, the css is copied to the same relative path when hosted as during development.
By simply defining the ol3 map as control on a GMaps map, we can
have a Google base map with arbitrary ol3 content on top. This
works with all ol3 renderers.
