[Android] make_apk.py should exit before it calls others when failed.

Because the current process only get the output of subprocess, but can't
get the exception from the subprocess, so the parent process can't check
whether subprocess failed, and continue to run the following script.

This patch forces the parent process to read the returncode of subprocess
before continue execution, and direct exit when the returncode doesn't
equal to 0.

BUG=https://github.com/crosswalk-project/crosswalk/issues/789
Merge pull request #802 from junmin-zhu/failedprocess

[Android] make_apk.py should exit before it calls others when failing.
[Android] Add target to pack xwalk core library

And archive the tarball of xwalk core library.
The tarball will be used by cordova xwalk container.
Merge pull request #813 from wang16/cordova_lib

[Android] Add target to pack xwalk core library
Bump version to 1.29.10.0
[Extensions] Use a IO message loop for extensions running in a thread

Some extensions (like the RawSocket) will need this kind of main loop
for watching file descriptor events. The Chromium Socket implementation
asserts when used in a non-IO message loop.
Merge pull request #815 from tmpsantos/io_loop2

[Extensions] Use a IO message loop for extensions running in a thread
[Tizen] Sensor support

SensorProvider class is designed to abstract sensor framework and
provide all sensor related notification for xwalk (currently support
rotation, orientation, will support motion, compass, geolocation
and gyroscope in future). TizenPlatformSensor is the platform
depended part for Tizen mobile system. It is designed to not depend
Tizen in build time.