Installation issues with dependencies

Hi there!
after reading your paper about Sacred, I wanted to try out a basic example using Sacred and Labwatch. However, I faced some issues while installing Labwatch on my machine (Ubuntu 17.10, Python 2.7.14):

1. Somehow, I had to install some of the dependencies manually, even that they are listed in the setup.py script:
- sudo apt-get install gfortran
- cython
- ConfigSpace (pip install from source)
- RoBo (pip install from source)

2. Using python 2.7.14, I ended up in this error message within RoBo:

```
Processing /home/benny/projects/labwatch
Complete output from command python setup.py egg_info:
Invalid MIT-MAGIC-COOKIE-1 key/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:57: GtkWarning: could not open display
warnings.warn(str(e), _gtk.Warning)
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-oZQ4Vu-build/setup.py", line 22, in
from labwatch import __about__
File "labwatch/__init__.py", line 4, in
from labwatch.assistant import LabAssistant
File "labwatch/assistant.py", line 18, in
from labwatch.optimizers.random_search import RandomSearch
File "labwatch/optimizers/__init__.py", line 14, in
from .bayesian_optimization import BayesianOptimization
File "labwatch/optimizers/bayesian_optimization.py", line 10, in
from robo.models.gaussian_process_mcmc import GaussianProcessMCMC
File "/usr/local/lib/python2.7/dist-packages/robo/models/gaussian_process_mcmc.py", line 10, in
from robo.models.gaussian_process import GaussianProcess
File "/usr/local/lib/python2.7/dist-packages/robo/models/gaussian_process.py", line 14, in
class GaussianProcess(BaseModel):
File "/usr/local/lib/python2.7/dist-packages/robo/models/gaussian_process.py", line 70, in GaussianProcess
def train(self, X, y, do_optimize=True):
TypeError: unbound method _check_shapes_train() must be called with BaseModel instance as first argument (got function instance instead)

----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-oZQ4Vu-build/
```
After I looked into the gausion_process code of RoBo, I have seen that the issue is is coming from an @ annotation. I thought maybe this is not supported before Python 3.6.3. Hence, I tried everything once more with python3... installing everything once more with pip3 ... and voilà ... the error is gone!

**Finally, my two questions:**

a) Is there no Python 2.7 support?
b) The [installation page of Labwatch](https://automl.github.io/labwatch/installation.html) does not say anything about having to install some dependencies manually. It says something about RoBo, but it sounds more like an optional step. Is that actually a required step? Both the installation of RoBo and ConfigSpace? Or am I just doing something wrong? Or is it just my machine having fun with me?

Thank you in advance!

Start with setup.py and the installation page linked in the issue, then reproduce the dependency installation under the reported Python 2.7 and Python 3 environments. Compare the declared dependencies with the packages the report had to install manually and investigate the RoBo traceback; done means the supported Python versions and required RoBo and ConfigSpace steps are documented or installation works as intended.

Written by the indexing model from the issue text.