py-solc is incompatible with Solidity compiler 0.5.0

* `py-solc` Version: 3.2.0
* `solc` Version: 0.5.0
* Python Version: 3.6.7
* OS: Linux

### What was wrong?
py-solc is incompatible with Solidity compiler 0.5.0

`--combined-json clone-bin` is deprecated in version 0.5.0 but is set in main.py and wrapper.py. Has to be removed.

Compile from source uses the solc compiler option to compile from stdin but does this incorrectly.
The fix would be to add `command += "-" ` at the end of the command creation.
A quick and dirty fix for both issues can be seen on my repository master branch at:

https://github.com/Jonasmpi/py-solc

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