ebuild: depend on <dev-lang/v8-3.16.5
ebuild: rebuild on v8 subslot change
scriptengine: don't use deprecated API

fixes #450
ebuild: we are now compatible with upstream v8 on master
Merge pull request #453 from karolherbst/bug450

we should not use v8::Externel::(Un)wrap anymore

fixes #450
npwrapper: add build script and eliminate 64/32 bit paths
npwrapper: use system wide installed flash plugin
ebuild: add adobe-flash dep
install-deps.sh: add flashplugin as dependency for arch linux.
PKGBUILD: git, release/desurium: add flashplugin as dependency.