Fix install

It matches setup.py.

Add a colored by group example

* fix collocation score computation on 2.7, remove words with empty counts.

* copy dict keys on python3

* trying to fix plurals

remove bigram example as all examples now do bigrams

add test for tokenization, let ``words_`` be a dict

add colormaps, always try horizontal/vertical if other doesn't fit!

remove relative_scaling form simple.py

add matplotlib to dependencies

* fix setting of self.words_, special case for a single word

* add matplotlib to travis script

* set matplotlib backend in tests

* hack for old matplotlib

* f...ine pep8 changes

* refactor tokenization, use collocations by default.

* trying to refactor sensibly

* return standard cases for each word, disambiguate for bigrams

* add simple smoke tests for the no-collocations path

* Added more words to list of stopwords

* Modified list of stopwords

* Modified list of stopwords- more restricted set included

* starting on bigrams example

* slight cleanup, seems to work well.

Copy STOPWORDS and add to it, then pass it (instead of passing None).

use setuptools, add install_requires

Let process_text() return a dict.

allow a custom regexp

Add recipe for building the package with conda

Use a set for the (lowercase) stopwords, instead of looking up every word via linear search

lower-case stopwords before using them.