Remove dependencies

 Removes chainconsumer and following requirements. These where causing
the CI to be very slow. Instead, rather than plotting, just list a
warning.

.gitlab-ci.yml

@@ -21,7 +21,6 @@ exitcode-jessie:
     - pip install -r requirements.txt
     - pip install coverage
     - pip install coverage-badge
-    - pip install chainconsumer  # Required by some of the example scripts
     - python setup.py install
     - coverage erase
     - coverage run --include=tupak/* -a test/prior_tests.py

requirements.txt

 future
 dynesty
 corner
-patsy>=0.4
 numpy>=1.9
 matplotlib>=2.0
-scipy>=0.19
+scipy
 gwpy
 pandas
 astropy

tupak/result.py

@@ -3,14 +3,14 @@ import os
 import numpy as np
 import deepdish
 import pandas as pd
-import tupak
 
 try:
     from chainconsumer import ChainConsumer
 except ImportError:
     def ChainConsumer():
-        raise ImportError(
-            "You do not have the optional module chainconsumer installed")
+        logging.warning(
+            "You do not have the optional module chainconsumer installed"
+            " unable to generate a corner plot")
 
 
 def result_file_name(outdir, label):