Badge tweaks
expose map for JuMPDicts ref #78
Little generalization to higher level ops
new syntax for groups of constraints with addConstraint
Merge pull request #160 from JuliaOpt/addConstraints

new addConstraint syntax for specifying groups of constraints
add missing zero methods
fixup for zero(QuadExpr) also
pre-compile callbacks for better timings
fix typo in docs, thanks to Joel
tidy indices
fix #163, thanks to @tkelman for the debugging work
closes #151
addelt -> addelt!
optionally use ArrayViews
interface change
merge duplicates in callbacks. closes #157
doc prep for 0.5
IPoptOptions -> IpoptOptions
Tidy up warnings
warn() should be used for unusual problem status
Base.warn_once() should be used for missing solver capabilities
add dot(::JuMPDict,::JuMPDict) (#148)