Fix conflict with assets plug-in

• A user found a conflict with the assets plugin.
• Fixed the warning in the admin plug-in page on a missing built_in_css

Updates for latest version of Grav 1.x

Several enhancements:
* Document the assets.js('bottom') issue on not uptodate themes
* Use cache->delete() when available in grav (version > 1.0.10)
* Minify support through gulp
* Support the language= param
* Updated the readme.md
* Using typescript (and namespace to avoid cluttering the JS globals)
* Smart enabled: false per page yaml configuration (emptying the cache and discarding markers)
* Smarter css style sheet
* Smart/more efficient asset generation
* Support additional Google map settings

First function complete version

googlemaps is a plugin for Grav.
The plugin recognizes special marker(s) in a Markdown document.
It replaces these with HTML Google map objects(s).
The Google map object is generated through Google's Google maps API.
Several markers and one KML overlay can be configured per googlemaps object.