Fixed reference to old getWgtFile method
Added hidden dependencies

ZipFile: Changes have been upstreamed and we can now use the official module.
xml2js, data2xml from npm registry.
jasmine-node as devDependencies

Jira issue: WP-833
Added more hidden dependencies

dcrypt is made optional as it doesn't provide an easy installer for windows.
Added the rest of the missing required modules.

Jira-issue: WP-833
Merge pull request #7 from andreasbotsikas/WP-833

Added hidden dependencies
Merge pull request #3 from andreasbotsikas/WP-624

Fixed reference to old getWgtFile method