[Tools] Remove bump-canary-version.sh.

It has been superseded by increment-version.py, and now that the canary
infrastructure has started using the new tool, we can safely remove the old
one.
[Android] Implement default xwalk client in runtime core.

1  Add the Ssl alert title to the file of android_xwalk_strings.grd.
2  Create a new class XWalkDefaultClient extended from class XWalkClient.
3  Create the method of onReceivedError() to handle the process of
   receiving error.
4  Create the method of onReceivedSslError() to handle the process of
   receiving ssl error.
[Android] Remove js_api as the input path of hello world app

Js_api folder in assets was already removed in #668.
Merge pull request #695 from ShDavidliu/master

[Android] Implement default xwalk client in runtime core.
Merge pull request #764 from wang16/fix_js_api

[Android] Fix a missed place when renaming js_api to jsapi
Merge pull request #762 from rakuco/remove-old-bump-canary-version-tool

[Tools] Remove bump-canary-version.sh.
Integration manifest parser with app build tools.

1. Add "--manifest=/path/to/manifest/file" support in make_apk.py
2. Adjust the icon API in the manifest parser, it shoud provide all
   information of the icon from the manifest.
3. Fix the icon path incorrect issue for "--icon" option.
4  Rewrite the "prepare_xwalk_app_template" target with gyp
   due to the bug in gyp system, that "copies" action doesn't respect
   the "dependencies".
5. Add unit test for make_apk.py, run it through following steps:
   * Switch to the outside of "src" directory.
   * Run the command "python src/xwalk/app/tools/android/make_apk_test.py
     --build-dir=src/out --target=Release"