Added DOI

Author: kpeeters

README.rst

@@ -1,11 +1,13 @@
 Cadabra
 =======
 
-|Build status|
+|Build status| |DOI|
 
 .. |Build status| image:: https://secure.travis-ci.org/kpeeters/cadabra2.svg?branch=master
    :target: http://travis-ci.org/kpeeters/cadabra2
-
+.. |DOI| image:: https://zenodo.org/badge/45484302.svg
+   :target: https://zenodo.org/badge/latestdoi/45484302
+				
 *A field-theory motivated approach to computer algebra.*
 
 Kasper Peeters <[email protected]>

core/algorithms/product_rule.cc

@@ -84,6 +84,10 @@ Algorithm::result_t product_rule::apply(iterator& it)
 	iterator rename_dummies_at = tr.end();
 
 	if(*prodnode->name=="\\pow") {
+		// FIXME: the code below assumes that the derivative acts on the first
+		// child of \pow only, so \partial_{x}{x^n} is done correctly, but
+		// \partial_{x}{e^x} becomes x e^{x-1} \partial_{x}{e} which is wrong.
+		
 		 sibling_iterator ar=tr.begin(prodnode);
 		 sibling_iterator pw=ar;
 		 ++pw;

web2/cadabra2/source/changelog.html

@@ -16,7 +16,7 @@ <h1>Change log</h1>
   development, even numbered ones are released in packaged form.
 </p>
 <a name="master"></a>
-<h3>github master</h3>
+<h3>2.1.5 (released 6-Aug-2017)</h3>
 <ul>
   <li>Introduced <tt><a href="/manual/map_sympy.html">map_sympy</a></tt>
   which can be used to apply Sympy functions to Cadabra expressions,