Documentation tweaks (`map!()` and `names()`)
update type of code_lowered to Callable instead of Function
initial stata support in benchmarks
add stata

stata support in scripts
Don't run Stata benchmark by default
Merge remote-tracking branch 'upstream/master' into stataperf
Merge branch 'master' of github.com:JuliaLang/julia
Add interpreted Stata code
Add ⊗ as synonym for kron
Add √ as synonym for sqrt
Add obelus (÷) as synonym for div
Add ∅ (empty set) as synonym for Set{Any}({})
Add ∈ as synonym for `in` and ∋ for containment
Add ⋅ as synonym for `dot`
Add ⊆ as synonym for `issubset`
More set relations ⊈, ⊂, ⊄, ⊊.

- Strict subsets ⊂, ⊊
- Negated synonyms ⊈, ⊄
Add ∩ and ∪ as synonyms for `intersect` and `union` resp.
Add △ as synonym for `symdiff`
Add negated element containments ∉, ∌
More comparsion operators ≠ (!=), ≡ (===), ≢ (!==), ≤ (<=), ≥ (>=), .≥ (.>=), .≤ (<=), .≠ (.!=)