[Runtime] Add GetApplicationByID in ApplicationService

Using GetApplicationByID replace with the GetApplicationStore, since it's very
dangrous to export the ApplicationStore outside ApplicationService.
[Runtime] Add switch "--list-apps" to list all installed applications from command line

Execute the xwalk with "--list-apps" switch will print all installed applications
information to standared IO stream.
Merge pull request #900 from takethathe/list

[Runtime] List all installed applications from command line