append v1 api to url and lowercase parameters

[jacoelho]

Convert parameters to lowercase

digital_ocean "True" value should be in lowercase: true

[zbal]

I like the to_lower function, but that'd also apply it to the name and may break when some of the arguments are either list or dict. I prefer for the moment applied individually on params creation (applied).

Added the v1/v2 support in api end-point