add text/6to5 to browser compilation script types
add explanation for gross Error.captureStackTrace polyfill
implement Scope so we can keep track of references to avoid collisions when generating ids
move util.getIds to types.getIds
move visitor-keys from traverse to types
add SequenceExpression and UnaryExpression builders
simplify VariableDeclaration ForStatement check
pass scope to transformers
cache scope ids and limit id variable declarations to kind
make id optional in t.getIds
default generateUid scope to Program
implement new and improved let scoping - fixes #91, fixes #102, fixes #124
fix linting errors
fix class computed methods
clean up let scoping transformer and add lots of comments
clean up some tests
add missing util require
fix indentation on generation comments tests
use _push instead of push on template literals end
fix code reference on generate