Independent element renderer

[avelino]

Today we have 3 types of render (grid, chart bar and chart line), we got to stop this feature module. By default the Open Mining will be provided with some basic render, if a user wants to implement a new type of rendered simply create a new policy and imports the same configuration file of renders.

In the backend should be read the configuration"renders" key the configuration file which is a list of files to be imported (in the index.html).