run _6to5-node using execvp() if available
Merge pull request #289 from monsanto/kexec

run _6to5-node using execvp() if available
fix wrong variable name for bin/6to5-node kexec catch
add kexec to optionalDependencies
switch to core-js from es6-symbol and es6-shim
disable es6-transpiler
Add interop require support for AMD and UMD
Merge pull request #295 from caseywebdev/amd-umd-interop-require

Add interop require support for AMD and UMD
Revert "switch to core-js from es6-symbol and es6-shim"

This reverts commit 37b2e747d59a057ac6c51e1361fd02d9f75a08dc.
add async generator functions to docs
Fix incorrect object reference in #295
Merge pull request #296 from caseywebdev/fix-295

Fix incorrect object reference in #295
microoptimizations
add async generator functions to docs
add custom regenerator runtime to build process
Merge branch 'master' into 2.0.0
remove commonStrict module formatter
use types.isSpecifierDefault in amd modules formatter
Clarify polyfill usage in node env
Merge pull request #297 from Dashed/patch-1

Clarify polyfill usage in node env