Change axis formatting from load function

[Vladimir85]

It might be useful to change the axis format form .load() method, not only on the initialization of the chart object.

Thanks.

[kimballce]

This is related to #292 and #735.

[Vladimir85]

@kimballce the resolution proposed in #292 should be considered as a hack and not the solution for the problem. Don't you think that this functionality should be implemented in the future?