Matrix inv take2

Remove the shared pickle changes

Pursuant to discussion at https://github.com/Theano/Theano/pull/153/files#r187252 I've renamed the function. I also added a docstring.

Conflicts:

	theano/sandbox/linalg/ops.py

Conflicts:

	theano/sandbox/linalg/tests/test_linalg.py

Conflicts:

	theano/sandbox/linalg/tests/test_linalg.py

Theano vision in documentation

Spelling + spacing fixes

Split/Join tests

Transpose dot opt

pep8 + missing imports

Windows doc fix

Besides fixing some typos, I removed the part about the installation
problems, which sounded a bit scary (after all we provide installation
instructions that are supposed to work).

The old form (PatternSub) had the problem that it wasn't calling broadcast_like
on the return value.  It would have been wrong to hack a broadcast_like into
gof.opt, so I rewrote these two optimizations as a function.

PatternSub is a really cool idea, in the future it might be worth writing a
TensorPatternSub that deals with tensor-specific issues, like casting,
dimshuffles, and rebroadcasts.