Added the shares_float and shares_float/all API

[Kasamuri]

Hello Everyone,
I've added the shares-float and shares-float/all
as available endpoints.

Since this is my first contribution to Open-Source please let me know,
if i messed something up :)

[daxm]

I think instead of having two methods, it should be a single method. Make the "all" as an optional boolean attribute that defaults to faults. What do you think?

[Kasamuri]

That would certainly a way to do that while reducing the total amounts of endpoints.
I will get to that in the next couple of days :)

[daxm]

Looks good!