python -m solc.install v0.4.11 gives "Empty installation"

* `py-solc` Version: 1.4.0
* `solc` Version: 0.4.11
* Python Version: 3.5
* OS: osx

### What was wrong?

Running `python -m solc.install v0.4.11`

... does not complete:

```
==> Caveats
To have launchd start ethereum/ethereum/ethereum now and restart at login:
brew services start ethereum/ethereum/ethereum
==> Summary
🍺 /usr/local/Cellar/ethereum/1.7.2: 10 files, 51.2MB, built in 1 minute 32 seconds
==> Upgrading paritytech/paritytech/parity --stable
==> Downloading http://d1h4xl4cr1h0mo.cloudfront.net/v1.7.9/x86_64-apple-darwin/parity
Already downloaded: /Users/mikkoohtamaa/Library/Caches/Homebrew/parity-1.7.9
Error: Empty installation
Traceback (most recent call last):
File "/usr/local/Cellar/python3/3.5.2_3/Frameworks/Python.framework/Versions/3.5/lib/python3.5/runpy.py", line 184, in _run_module_as_main
"__main__", mod_spec)
File "/usr/local/Cellar/python3/3.5.2_3/Frameworks/Python.framework/Versions/3.5/lib/python3.5/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/Users/mikkoohtamaa/code/tm/trading/venv/lib/python3.5/site-packages/solc/install.py", line 483, in
install_solc(identifier)
File "/Users/mikkoohtamaa/code/tm/trading/venv/lib/python3.5/site-packages/solc/install.py", line 473, in install_solc
install_fn()
File "/Users/mikkoohtamaa/code/tm/trading/venv/lib/python3.5/site-packages/solc/install.py", line 406, in install_from_source
install_solc_dependencies(identifier)
File "/Users/mikkoohtamaa/code/tm/trading/venv/lib/python3.5/site-packages/solc/install.py", line 301, in install_solc_dependencies
install_deps_script_path,
File "/Users/mikkoohtamaa/code/tm/trading/venv/lib/python3.5/site-packages/solc/install.py", line 98, in check_subprocess_call
**proc_kwargs
File "/usr/local/Cellar/python3/3.5.2_3/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 581, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['sh', '/Users/mikkoohtamaa/.py-solc/solc-v0.4.11/source/scripts/install_deps.sh']' returned non-zero exit status 1
make: *** [install-solc-0-4-11] Error 1
```

Not sure what `Empty installation` means.

#### Cute Animal Picture

```

______________
| D.A.B.'S | (__) (__) (__) (__)
| USED | (uu) (uu) (uu) (uu)
| COWS | /-------\/ /-------\/ /-------\/ /-------\/
|____________| / | || / | || / | || / | ||
|| * ||----|| * ||----|| * ||----|| * ||----||
|| ~~ ~~ ~~ ~~ ~~ ~~ ~~ ~~
______||_______
| EASY CREDIT | (__) (__) (__) (__)
|_____________| (uu) (uu) (uu) (uu)
|| /-------\/ /-------\/ /-------\/ /-------\/
|| / | || / | || / | || / | ||
|| * ||----|| * ||----|| * ||----|| * ||----||
|| ~~ ~~ ~~ ~~ ~~ ~~ ~~ ~~
```