ignore iso files
fixed invocation for ntpclient in order to log to /var/lib/boot2docker/log/ntpclient.log properly
shortened min_delay and interval to avoid drifts
Merge pull request #554 from rufiao/master

ntpclient with shorter update and correct logging
bump kernel to 3.16.4
Merge pull request #552 from unclejack/bump_kernel_3.16.3

Bump kernel to 3.16.4
Turn on TLS cert generation by default

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Update VBOX_VERSION to 4.3.18

https://www.virtualbox.org/wiki/Changelog
Merge pull request #563 from aanand/turn-on-tls

Turn on TLS and cert generation by default
Merge pull request #567 from rogeriopradoj/patch-1

Update VBOX_VERSION to 4.3.18