Squashed 'tests/files/' changes from e558aa4..559268b

559268b go failure
473f67f BlockTests More Invalid RLPs updated to latest develop
296c653 Fixed test to 15 header items
d011a67 Merge branch 'develop' of git://github.com/ethereum/tests into develop
44a3664 Updated to 16mb size

git-subtree-dir: tests/files
git-subtree-split: 559268ba4b454152c17b343db33d617877f30a3a