Thanks Jitendra!
The above link answered most of my question.
I have installed Eclipse Luna but unable to install the below ADT plugins from SAP Development Tools for Eclipse - Luna Software Repository:
1) SAP NetWeaver Gateway Productivity Accelerator (GWPA)
2) UI Development Toolkit for HTML5
As per the above link, the workaround for now is that we need to continue using the Juno link (SAP Development Tools for Eclipse - Juno Software Repository) to install the above two ADT plugins as of now.
Regards,
Aaron D'Cunha