Fix JuliaLang/julia#6665

Provides airyx in addition to bessel[jyikh]x
Updates following discussion in JuliaLang/julia#6665

Rather than introducing bessel[hijky]x functions, introduce optional
positional argument to bessel[hijky] and airy for scaled version.
automatically NULL-terminate UTF16 data for passing to Windows (and similar) APIs
NULL-terminate UTF32String data for consistency; deprecate UTF32String(c::Char...) in favor of utf32(c...); add conversion to UTF32String from binary data that looks at the BOM
NEWS updates for UTF16String and UTF32String
added utfXX(ptr[,len]) functions analogous to bytestring, added WString and wstring aliases to make wchar_t* APIs usable
fix utf32/UTF32String mixup
add deprecation for UTF32String(s::String)
avoid deprecation warning in converting UTFxxString to equal-sized integer types
type typo (and regression test) in utfXX(::Ptr{IntXX})
return a Failure instead of rethrowing an expection in @test_throws
See: https://github.com/JuliaLang/julia/issues/7051
cosmetics: remove tab, fix alignment
add unit tests for Base.Test. Missing tests for @test_approx_eq, but will open discussion with an issue.
add broadcasting .//
Merge branch 'master' of https://github.com/JuliaLang/julia into besselx

Conflicts:
	base/math.jl

Keeping track of special functions reorganization
fa742208b31a6640a82a6bf29f97c21cba471ff0
Add a comma for clarity in pull_request and remove deprecated readsfrom in Pkg.GitHub.curl
Update windows README with package development notes
fix #7074
formatting tweaks in reflection chapter of manual
fix #7062