Adding a option to getParams and expandParams

[seltix5]

currently the only function to set params ( "setParams" ) will replace the current data with new data, this is not always enough. Adding "getParams" and "expandParams" will add the option to manipulate the params without erase them. Without this options it is not possible to update multiple times the params from different sources.

i think this 2 simple functions are useful, what do you think?

[seltix5]

I do can update the documentation, but about the tests I dont know how it works or what I need to do :/

[seltix5]

Docs updated. Can you help me with the tests?

[rnicholus]

Sure - i'll try to make some time to write these soon.