Add some functionality

Hi,

I used your firebase wrapper for my school project. Since there are some features that not yet available, so
I tried to add it by myself.

1. Change library to newer version (for compatibility reason)
2. Add some useful method :
    patch : send data using HTTP PATCH
    addQuery : add query to request through passing parameter

Thanks
ps: looks like I forgot to add description on some method, but I thinks it's self explanatory.