Installing Pyrobuf without c compiler

[vogt31337]

Hi,

somewhat analogue to #113 is it possible to change the install procedure to not require a c compiler?

What happens:
Installation fails, due to no c-compiler

What is expected:
Installation success, but displays a warning, that compilation is not possible, only usage of pre compiled modules is possible. Maybe a hint if you want to use compilation to install a compiler of your choice.

Scenario:
Software written by someone, get's deployed with all needed modules (cythonized, compiled, ...).
But can't be installed on second machine due to installation failure of pyrobuf (missing c-compiler). Owner of second machine does not want to / can't download a c-compiler.

BR