run examples and demos with xwalk-launcher

As /usr/bin/xwalk binary doesn't exist anymore, we can not launch
examples and demos from xwalk binary.

In addition, this patch removes tizen-extensions-crosswalk script file
which appears to be useless right now.

BUG=XWALK-2370
Bump version to 0.96
Merge pull request #373 from eurogiciel-oss/XWALK-2370

run examples and demos with xwalk-launcher
Bump version to 0.97
Multi user features :

->Use Usr App related fonctions instead of Global App related Functions

Change-Id: I85dc3729d79dd35eeea77216b3f199266a896a29
Signed-off-by: Sabera Djelti (sdi2) <sabera.djelti@open.eurogiciel.org>