fixed a few typos and removed unnecessary code.
Added linalg import back.
Merge pull request #1865 from caglar/fix_typos

fixed a few typos and removed unnecessary code.
Refactored sparse matrices comparison tests
Merge pull request #1866 from Hengjean/sparseComparisonOp

Refactored sparse matrices comparison tests
Merge branch 'master' of git://github.com/Theano/Theano
Merge branch 'master' of https://github.com/rahul003/Theano
Merge branch 'master' of https://github.com/rahul003/Theano
end of day push