Image picker for mapstore templates.

* Include some ux code and resources for image upload
* New ux extended HtmlEditor that includes the image picker
* Changes on MSMTemplatePanel to include the new editor
Merge branch 'templates' of github.com:alediator/mapstore into templates
Fixes break template load on debug

* You need to include `geoStoreBase` url on mapstore and manager config.
Templates fix

Refresh the templates grid when add a new one.