changing MPB setvartype! interface.
add support for binary
add type annotation for setvartype
update REQUIRE.
last compatibility fix.
Merge pull request #16 from JuliaOpt/semicont

changing MPB setvartype! interface.
get Pkg.test working
attempt at windows build
Merge branch 'master' into cbc_c

Conflicts:
	src/CbcSolverInterface.jl