Merge pull request jump-dev#1002 from JuliaOpt/mlubin-patch-1

update bound on ForwardDiff

prep for 0.16.1

Merge pull request jump-dev#979 from JuliaOpt/ml/tidy

fix ip_dual_solvers and relaxation test

JuMP v0.15.1 [a0b5f0d]

JuMP v0.15.0 [4588045]

JuMP v0.14.2 [45bf62e]

JuMP v0.14.1 [c89327d]

JuMP v0.14.0 [8b3074a]

JuMP v0.13.2 [1ea8781]

JuMP v0.13.1 [4717556]