Merge pull request #7 from bjodah/pretty_readme

Add syntax highlighting and output to README example.

README.rst

@@ -17,15 +17,16 @@ PubChemPy provides a way to interact with PubChem in Python. It allows chemical
 similarity, chemical standardization, conversion between chemical file formats, depiction and retrieval of chemical
 properties.
 
-::
-
-    from pubchempy import get_compounds, Compound
+.. code:: python
 
-    comp = Compound.from_cid(1423)
-    print comp.isomeric_smiles
+    >>> from pubchempy import get_compounds, Compound
+    >>> comp = Compound.from_cid(1423)
+    >>> print(comp.isomeric_smiles)
+    CCCCCCCNC1CCCC1CCCCCCC(=O)O
+    >>> comps = get_compounds('Aspirin', 'name')
+    >>> print(comps[0].xlogp)
+    1.2
 
-    comps = get_compounds('Aspirin', 'name')
-    print comps[0].xlogp
 
 Installation
 ------------