fixes and tests for gemv generators
gemv fixes and tests
Made AST conversion better.
Got more functions working with AST
adding support for lambda functions

- and tests for numpy and math functions

- rounding 2nd arg for math.pow test
  (it does not like negatives raised to non-integers)
Merge remote-tracking branch 'upstream/master' into ast-fixes

- This is a straightforward merge of @bptripp's stuff
- I'm going to go back and make another commit to better
  integrate our work
Got all ast conversion tests passing

- @bptripp's lambda function code is now fully integrated
  with my additions
Merge pull request #42 from hunse/ast-fixes

Ast conversion improvements from @hunse and @bptripp
updated nvidia/debian install instructions
benchmark_circconv rewrite for scripting
added GFLOP/s to profiling
networkx in requirements
bandwidth profiling
gemv w many_dots instead of reference
catch numpy vectorization error in ast_conversion
removed debug print
many_impls falls back when A_js is None
fix exception line for multiple E types
tweaking example benchmark
made gemv_prog inherit from object not Prog