Remove note about old gpu backend

Correct spelling mistakes.

Suggest a fix (and tests) for gpudnnreduction when axes to reduce have size 1.

Attempt to prevent re-initialization of the GPU in a child process

Bugfix: spaces in temp path prevents cudnn init

When initializing theano with cudnn, _try_compile_tmp is eventually run to verify compiling a test program with gcc. This function requests a temporary path for the test program from tempfile.py. Rarely, tempfile.py can return a path that has spaces in it. If this happens, gcc cannot parse it correctly and throws an error. This change prevents the issue by wrapping the temporary path in quotes.

For an example case: I was running python through an ssh client which accesses the home directory through a symlink in C:\Program Files\openssh\. Tempfile.py defaulted to the working directory and returned the path including the space in "Program Files", which crashed gcc.

Prepare final release 1.0.0

Err msg et small opt in python code

Don't complain about MKL threading on mac since openmp doesn't work.

Fix problems in release buildbot

Prepare release candidate 1.0.0rc1

Optimize SUM(x^2), SUM(ABS(X)) and MAX(ABS(X)) to cuDNN reduction.