Update Mac GPU setup instructions (tensorflow#3575)

Merge pull request tensorflow#2981 from caisq/r0.9-3

Update build file to fix tensorflow#2703

Reorganize installation instructions

Avoid too much duplication (still, three sections are almost copied) when specifying installation instructions. Added 3.5 linux binaries.

Update cuda instructions to be more specific about versions (tensorfl…

…ow#2065)

switch docker links from b.gcr.io to gcr.io (tensorflow#1911)

Merge pull request tensorflow#1213 from vrv/r0.7

Revert "Fix tensorboard import path"

Merge pull request tensorflow#1116 from jendap/keep-numpy-version-in-…

…pip.sh

keep numpy version in pip.sh

Change more 0.5 to 0.6

TensorFlow 0.6.0

Major Features and Improvements

* Python 3.3+ support via changes to python codebase and ability
  to specify python version via ./configure.

* Some improvements to GPU performance and memory usage:
  [convnet benchmarks](soumith/convnet-benchmarks#66)
  roughly equivalent with native cudnn v2 performance.  Improvements mostly due
  to moving to 32-bit indices, faster shuffling kernels.  More improvements to
  come in later releases.

Bug fixes

* Lots of fixes to documentation and tutorials, many contributed
  by the public.

* 271 closed issues on github issues.

Backwards-incompatible changes

* tf.nn.fixed_unigram_candidate_sampler changed its default 'distortion'
  attribute from 0.0 to 1.0. This was a bug in the original release
  that is now fixed.

TensorFlow 0.5.0: initial public release.