Fixes #1829. Preserve variable scope in the REPL
Merge pull request #2814 from epidemian/issue1829

Fixes #1829. Preserve variable scope in the REPL
Add REPL scoping tests
Merge remote-tracking branch 'epidemian/issue1829'
@epidemian typo
port patchStackTrace from Redux
accept override
Merge branch 'source-maps-in-node' of https://github.com/hden/coffee-script into source-maps-in-node