add sha1 of eigen download file so it does not have to redownload if …

Merge branch 'cyphers/autodiff' of https://github.com/NervanaSystems/private-ngraph-cpp into cyphers/autodiff

Merge branch 'cyphers/autodiff' of https://github.com/NervanaSystems/private-ngraph-cpp into cyphers/autodiff

change all passes to take shared_ptr rather than naked pointer

missing include

fixing vector length

format fixes

avoid repeating input values in a test

use input

trig/hyper funcs

* Formatting; fix erroneous "type_prop" classification for reduce and slice tests

* Clarify comment

* Add step parameter to slice, with type checking but not (yet) implementation in VM

* Add elementwise exp to VM

* Formatting

Bob/warnings

* Type checking for reshape op

* Formatting

* Implement reduce op for matrices and smaller in VM

* Formatting

* Missing include for Ubuntu

* Remove IndexBuiltin class

Docker: Add more deps