Wrap dynamic author list generation in setup.py

If the user cannot write in the MDAnalysis source directory, writing the
list of authors will fail. This commit wrap the generation so the
install proceed with a warning instead of crashing.

package/setup.py

@@ -44,6 +44,7 @@
 import sys
 import shutil
 import tempfile
+import warnings
 
 # Make sure I have the right Python version.
 if sys.version_info[:2] < (2, 7):
@@ -423,7 +424,10 @@ def dynamic_author_list():
 
 
 if __name__ == '__main__':
-    dynamic_author_list()
+    try:
+        dynamic_author_list()
+    except (OSError, IOError):
+        warnings.warn('Cannot write the list of authors.')
 
     with open("SUMMARY.txt") as summary:
         LONG_DESCRIPTION = summary.read()

testsuite/setup.py

@@ -42,6 +42,7 @@
 import sys
 import os
 import glob
+import warnings
 
 
 def dynamic_author_list():
@@ -122,7 +123,10 @@ def dynamic_author_list():
 
 
 if __name__ == '__main__':
-    dynamic_author_list()
+    try:
+        dynamic_author_list()
+    except (OSError, IOError):
+        warnings.warn('Cannot write the list of authors.')
 
     RELEASE = "0.14.1-dev0"  # this must be in-sync with MDAnalysis
     LONG_DESCRIPTION = \