Add DictMixin/OrderedDict to theano.compat in PY3.

Reordered for ease of reading (same order in if/else).

Fix test, compile less, doc, add tests.

Improve compile time on slow filesystems

Scan opt to push out Dot products outside of Scan's inner graph

CRASH/OPT fix (quick to review)

Removed comparisons with None

Fix broadcast pattern of dnn conv op.

Revert change that break too many test in floatX=float32

[CRASH] we where returning a python int while this was reused in Elemwise.perform that expect ndarray.

language fix

Fix scan_args for the 'as_while' case properly.