Merge pull request #194 from dubek/literal-empty-list

Fix handling of literal empty list in several impls

diff --cc es6/step6_file.js
Simple merge

diff --cc es6/step7_quote.js
Simple merge

diff --cc es6/step8_macros.js
Simple merge

diff --cc es6/step9_try.js
Simple merge

diff --cc es6/stepA_mal.js
Simple merge

diff --cc process/guide.md
Simple merge

diff --cc ps/stepA_mal.ps
Simple merge