remove spurious length from Buffer; remove spurious length = 0 from Node
fixed severe bug leading to ALL instances sharing same attributes and childNodes table
removed spurious length = 0
assert that instances do not share childNodes and attributes tables
initialize empty attributes not set by gumbo parser
drop global attributes table
appendChild impl possible after fixing several instantiation bugs
check if attributes exists at all
initialize attributes table
check that Node:walk works
assert some basic instantiation properties; basic appendChild check
print wrong length on failure
check walk
add walk.lua
check if attributes exists at all
additional checks
implemented insertBefore
whitespace
Rebase to current upstream master

Conflicts:
	gumbo/dom/Node.lua