Bug: layer control doesn't work
*Created by: slifty* In my our [implementation of the layer control title](https://github.com/OpenTechStrategies/SimpleMaps/pull/32/files) I accidentally broke the actual layer control! This is because by re-setting the innerHTML I wiped away the DOM elements (and associated events) that had been created. We need to instead insert the title element into the DOM more directly.
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