add nltk to requirements

- needed for chemical equation parsing, which is about to appear in capa

add nltk to requirements
- needed for chemical equation parsing, which is about to appear in capa
cd934421 · Victor Shnayder · 47947e0a · cd934421
Commit cd934421 authored Oct 08, 2012 by Victor Shnayder
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requirements.txt
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--- a/requirements.txt
+++ b/requirements.txt
@@ -49,3 +49,4 @@ networkx
 pygraphviz
 -r repo-requirements.txt
 pil
+nltk