Added, documented push and append for GenericAffExpr
try to fix travis
Merge pull request #95 from JuliaOpt/affappend2

Added, documented push and append for GenericAffExpr
Fix redundant word in affexpr docs
detect ranges with steps. fixes #93
Merge branch 'master' of github.com:JuliaOpt/JuMP.jl
add tests for #93
clean commit for dictPrint
Merge pull request #97 from JuliaOpt/dictPrint2

clean commit for dictPrint
better test for empty variable names
New IJulia approach
Fix subtle issue with show(Model)
Added stuff for regular print
new show(model) method
no #quad constrs in show(model) by default
add isempty methods; tweak printing for problem sense in show(model)
Pretty printing
Refactoring out printing stuff
Merge in new show
Variable and model printing redone, plus tests