[Content] Add API argument validation

Validate the method arguments aganist the signature.
Throw TYPE_MISMATCH_ERR exception is no match.
Use the new xwalk.utils module.
Merge pull request #314 from poussa/tct-fixes-3

[Content] Add API argument validation
Bump version to 0.63
[Download] Use new C++ wrapper in common/extension.h

ExtensionAdapater should be deperacated by common::Extension and
common::Instance.
Fix build issue on desktop.

libtzplatform-config dependency is introduced by commit 0c5d1dc2, it
should be under Tizen profile only, otherwise desktop will fail to
configure.
Merge pull request #320 from halton/download_refac

[Download] Use new C++ wrapper in common/extension.h
[power] throw an exception instead of blocking forever

In synchronous calls, throw an exception instead of blocking
forever when the underlying system API returns an error.
Modified example to show usage.

BUG=XWALK-1390
Merge pull request #316 from eurogiciel-oss/XWALK-1390

[power] throw an exception instead of blocking forever
Merge pull request #321 from halton/tzplatform-config

Fix build issue on desktop.