Avoid breaks in tables

Fixes #240.

Author: rddaz2013

src/nbsphinx.py

@@ -1086,7 +1086,9 @@ def decode(data):
         # see issue #155
         cmd += ['--eol', 'lf']
     cmd1 = cmd + ['--from', fmt, '--to', 'json']
+    
     cmd2 = cmd + ['--from', 'json', '--to', to]
+    cmd2 += ['--columns=500']  # Avoid breaks in tables, see issue #240
 
     p = subprocess.Popen(cmd1, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
     json_data, _ = p.communicate(encode(source))