<commit_before>Parse molecule strings
----------------------

This parser implementation parses a string representing a molecule and groups
elements. For example, the string

~~~~
(C2H2)2NH3
~~~~

Gets parsed into

~~~~
4 C
7 H
1 N
~~~~
<commit_msg>Another go at the README<commit_after>Parse molecule strings
----------------------

This parser implementation parses a string representing a molecule and groups
elements. For example, the string

~~~~
(C2H2)2NH3
~~~~

Gets parsed into

~~~~
molecule (canonical form C4H4N1H3): 4:C 7:H 1:N
~~~~

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