Revert "Update for Theano v0.7.0 release"

This reverts commit 888487b.

Author: twiecki

readme.md

@@ -35,9 +35,11 @@ Check out the [Tutorial](http://pymc-devs.github.io/pymc3/getting_started/)!
 The latest version of PyMC 3 can be installed from the master branch using pip:
 
 ```
-pip install git+https://github.com/pymc-devs/pymc3
+pip install --process-dependency-links git+https://github.com/pymc-devs/pymc3
 ```
 
+The `--process-dependency-links` flag ensures that the developmental branch of Theano, which PyMC requires, is installed. If a recent developmental version of Theano has been installed with another method, this flag can be dropped.
+
 Another option is to clone the repository and install PyMC using `python setup.py install` or `python setup.py develop`.
 
 **Note:** Running `pip install pymc` will install PyMC 2.3, not PyMC 3, from PyPI.

setup.py

@@ -27,12 +27,16 @@
                'Operating System :: OS Independent']
 
 install_reqs = ['numpy>=1.7.1', 'scipy>=0.12.0', 'matplotlib>=1.2.1',
-                'Theano>=0.7.0']
+                'Theano<=0.7dev']
 
 test_reqs = ['nose']
 if sys.version_info[0] == 2:  # py3 has mock in stdlib
     test_reqs.append('mock')
 
+## The current release of Theano does not support `as_op` decorator, so
+## we're using the developmental version from github.
+dep_links = ['https://github.com/Theano/Theano/tarball/master#egg=Theano-0.7dev']
+
 if __name__ == "__main__":
     setup(name=DISTNAME,
           version=VERSION,
@@ -49,5 +53,6 @@
           package_data = {'pymc3.examples': ['data/*.*']},
           classifiers=classifiers,
           install_requires=install_reqs,
+          dependency_links=dep_links,
           tests_require=test_reqs,
           test_suite='nose.collector')