update Julia nightly download location
Merge pull request #186 from tkelman/patch-1

update Julia nightly download location
New style sudoku
loosen tolerances. fixes #182
fix check for GLPK, ref #182
avoid Pkg.installed because it's slow
MathProgBase.MissingSolver no longer defined
fix ArrayViews test
fix for change in ReverseDiffSparse
prep for 0.5.3
remove importall Base; using MathProgBase -> import MathProgBase. fixes #175
Merge pull request #189 from JuliaOpt/fix175

Fix #175
move performance tests to separate directory
fix type instability in getValue
initial port of SDP

add missing field in Model constructor

change behavior for x'*Q*x

minor fixes

work towards fixing tests
rebase and add explicit annotations to imported functions
tests pass (but still incomplete)