Cordova code ported from browser implementation.

Cordova code ported from browser implementation.

The 'src/lib' folder provides the cordova implementation for Tizen.
'src/lib/plugins' contains common code of plugins, downloaded from cordova repositories, was not altered.
'src/lib/cordova-5.1.1.js' was adapted from cordova.js file generated for browser.
'src/lib/cordova_plugins.js' contains list of files for plugins (currently only cordova-plugin-file).

Tizen-specific code follows plugin-style implementation of cordova (see 'src/file/cordova_file_api.js').

Change-Id: I6ade657781acd8e9595f5179364ceb940088458e
Signed-off-by: Pawel Andruszkiewicz <p.andruszkie@samsung.com>