Add support for pure python AES implementation (#78)

setup.py

@@ -6,19 +6,23 @@ from setuptools import setup, find_packages
 import sys
 import warnings
 
-dynamic_requires = []
+try:
+    import pyaes
+    dynamic_requires = ["pyaes==1.6.0"]
+except ImportError, e:
+    dynamic_requires = ['pycrypto==2.6.1']
 
 version = 0.3
 
 setup(
     name='broadlink',
-    version=0.3,
+    version=0.4,
     author='Matthew Garrett',
     author_email='mjg59@srcf.ucam.org',
     url='http://github.com/mjg59/python-broadlink',
     packages=find_packages(),
     scripts=[],
-    install_requires=['pycrypto==2.6.1'],
+    install_requires=dynamic_requires,
     description='Python API for controlling Broadlink IR controllers',
     classifiers=[
         'Development Status :: 4 - Beta',