todo

note that it only accepts minimization problems!
test that varialbes not present in the problem raise an error
make sure to check that stuffing is correct
- check for more than one find
python2 compatible?
separate out stuffing and replacing.
ecos and SCS should both work
separate out SCS and cySCS
solving and saving warm-start params can be decomplected
extra tests that prox is correct

todo

full cvxpy version
ecos version
checks on the stuffing being correct
tests for projection problems