Fixed issue with pow grad function trying to evalutate log at 0. Issue 1780
Added unit test.
Note: issue still occurs in debugmode.
Fixed error message for scan op dimension mismatch
Added equal and notEqual operation between sparse matrices
Added support for sparse-dense matrices comparison, tests and updated documentation.
Added scipy version check
Modified version check
Added support for sparse matrix format bsr, along with format check
Fixed a little formatting error
Renamed function eq and neq
Fixed comment
Added le, lt, ge, gt and associated test cases
fix for shared sparse variable format
Added documentation
Merge pull request #1855 from Hengjean/sparseBsr

Added support for sparse matrix format bsr, along with format check
made fixes and tweaks
fixed formatting
small test speed up
Small test speed up
remove duplicate test case and simplify test.
Make test faster by compiling less theano fct.