Added doc on sliding windows related operaitons
Fixed spelling
Added more info about inputs and restrictions
Fixed neigbours doc according to remarks
Merge github.com:Theano/Theano into doc_fix
Moved neighbours into tensor.nnet
Fixed typos, merged documentation, added references
Added information about gradient computation
Merged documentation with docstrings
Fixed ordering of documentation
Fixed punctuation, fixed #2166
Slightly cleaned up registration of GPU convolution optimizers and corresponding tags
Updated documentation to match current convolution code
Merge pull request #2197 from dmitriy-serdyuk/doc_fix

Documentation for sliding windows
Link to Theano's cuDNN documentation
More elaborate cuDNN installation instructions
Merge pull request #2255 from f0k/cleaner-conv-opt

Slightly clean up registration of GPU convolution optimizers
change opt name to follow our standard
Add opt local_adv_sub1_adv_inc_sub1

AdvancedSubtensor1(AdvancedIncSubtensor1(0s, y, idx), idx) -> y
AdvancedSubtensor1(AdvancedSetSubtensor1(x, y, idx), idx) -> y

gh-2246

TODO: doc the new tag
optimize consecutive cast