build-artik: support release_version and release_date
build-artik: support release_version and release_date

This patch supports to read the release version and date from command
line. This could help the jenkins parses the information from the submit
tag. You could specify the parameters like below:

./release.sh -c config/artik5.cfg -v A50GC0E-3AF-01020 -d 20150911.113324

Furthermore, this patch changes the output directory to include the
release version.

The target directory will be
- artik5/$RELEASE_VER/$RELEASE_DATE

Change-Id: Ia0125f7c2677fe64aeb6f07263cc6279e959c281
Signed-off-by: Chanho Park <8ec285a53e21b773fd914e03c50e1b6431bc9aa8@samsung.com>

SamsungARTIK/build-artik