Fixes "-m32" not found error on Raspberry Pi 2

Fix problems in the buildbot

Prepare 0.7rc2

[WIP] Disable some optimization that could cause problem with cudnn v2 rc3.

This fixes the "-m32" not found error on Raspberry Pi 2, when importing
theano.

Fix connection_pattern and add test

Fix the broadcastable pattern of tensordot's output

Fix in local_reduce_join with axis=None

Skip flake8 if not installed

Fix problem with border_mode = <int>

Fix infer_shape for pooling, skip unimplemented test cases

Include pep8 autocheck test + while list (from blocks) #2503

Add missing import