Added clean to Makefile and fixed `make test/bytecode/`
Applied jshint suggestions on web javascript (except those regarding __proto__ deprecatedness, which will be worked on later)
Applied jshint suggestions on javascript lib (except those regarding __proto__ deprecatedness, case fallthrough and leaking 'exports', which will be worked on later)
lib/pretty.js no longer leaks exports
jshint compliant fallthrough comment
Got rid of __proto__
Cleaned jshint