Merge pull request #16 from JuliaLang/jn/dylib

fix some build issues

Flip conditional

We accidentally flipped the conditional to do the exact opposite of what we wanted.

Merge pull request #13 from JuliaLang/aa/macos-mojave

Pass -stdlib=libstdc++ when using Xcode 8 or newer

Merge pull request #4 from vtjnash/jn/ifdef

use #ifdef in public headers instead of just #if

Add the ability to rename symbols

Create README.md

Create README.md

Add option to step with DWARF

Don't print debug messages

Fix compiler warning