add +/- for FloatRange (fix #6973)
Merge branch 'floatrange_ops' of github.com:stevengj/julia into stevengj-floatrange_ops
small NEWS edits
Merge branch 'master' of https://github.com/JuliaLang/julia
remove some duplication in foldl by letting evaluate() handle Callable
minor tweak of countnz & count + some cosmetic changes in reduce.jl

countnz(a::AbstractArray) is not needed (which was implemented in the same way as countnz(itr))
fix FloatRange{T}+FloatRange{T} definition
Merge branch 'stevengj-floatrange_ops'
countnz specialized on arrays
use U+27E8/27E9 (mathematical angle bracket) for langle/rangle, instead of U+2329/232A (angle bracket), as the former are recommended by Unicode for math & technical usage
Merge pull request #6999 from lindahua/dh/reorg2

minor tweak of countnz & count + some cosmetic changes in reduce.jl