[Tools] Remove some dead code from fetch_deps.py.
[Tools] fetch_deps: Call sys.exit() only at the very end.

Stop making main() sometimes just return a value and sometimes exit()ing
directly: standardize on calling sys.exit() with main()s return for
consistency and also to accommodate adding calls to more DepsFetcher
methods in the future.
Merge pull request #1688 from shaochangbin/fix-windows-build-issue

[Runtime] Fix buildbot failure on Windows for PR#1667.
[Tools] Add scm-remove-wrong-checkout.py.

This is a helper script intended to be invoked via "gclient recurse".
fetch_deps.py calls it automatically.

It is intended to remove a directory pointed to by a gclient entry when it
is supposed to be a git checkout but contains an svn one (and vice-versa).

The main idea is to prepare the ground for using our v8-crosswalk
repository: since V8 so far has been cloned from Google's SVN repository, if
we then switch to our git repository gclient sync will fail.
Merge pull request #1690 from rakuco/scm-checkout-verifier

[Tools] Add scm-remove-wrong-checkout.py.
[Runtime] Add manifest handler for widget packaged applications.

The CL parses manifest keys required by JavaScript widget interface,
and save mapped key value pairs in ManifestData, so that it can be read
by widget extension.

We can also extend this CL to validate the widget configuration keys in
future.
[Tizen][Runtime] Implement Widget API.

This commit supports Widget API on Tizen(exclude 'preferences' attribute).
The API provides application programming interfaces that enables ability
to access some of the metadata declared in a widget's configuration
document, such as 'name', 'author', 'description'.

Spec:
http://www.w3.org/TR/widgets-apis/#the-widget-interface

The 'preferences' attribute implementation will be provided later.