Theano _print_Derivative uses theano.tensor.Rop
_print_MatrixSlice -> theano.Subtensor
add theano_simplify to test_theanocode. fix deriv
BlockMatrix -> theano.tensor.join
block_collapse handles inverse, transpose.

Also uses bottom_up instead of top_down
remove incorrect block_collapse inverse test
style refactor BlockMatrix._eval_inverse
integrative test for theano, blockmatrix, inverse
doctest the vectorize function
Latex _print_MatrixSymbol = _print_Symbol
test bc_transpose
Merge pull request #1968 from thisch/doctest_vectorize

doctest the vectorize function
Merge pull request #1965 from mrocklin/theano-derivative-rop

Theano matrix printing and Derivative
Removed from assumptions/ all the extra functions, returning just True/False (issue 2152)

    Use instead AlwaysTrue/False methods, defined in CommonHandler class
Merge pull request #1973 from skirpichev/2152-rishabh

Removed from assumptions/ all the extra functions, returning just True/False (issue 2152)
Add Rishabh Dixit to the AUTHORS/aboutus. Welcome to SymPy!
regular derivative in latex, fix latex derivative bug
partial versus ordinary derivative in mathml
pretty-print partial derivative symbol
more sophisticated logic for deciding whether to use a partial derivative