add requirements.txt, and install pandoc

requirements.txt

@@ -0,0 +1,4 b''
+docutils
+markdown
+ipython
+pygments

.travis.yml

@@ -1,4 +1,6 b''
 language: python
 python:
     - 2.7
+before_script:
+  - sudo apt-get install pandoc
 script: nosetests

pylintrc

@@ -38,7 +38,7 b' load-plugins='
 # Enable all checker(s) except those with the given id(s). This option conflict
 # with the disable-checker option
 disable-checker=C0323,W0142,C0301,C0103,C0111,E0213,C0302,C0203,W0703,R0201,C0111,C0103,C0301
-disable=R0201,C0111,C0103,C0301
+disable=R0201,C0111,C0103,C0301,R0904
 
 # Enable all messages in the listed categories.
 #enable-msg-cat=