Reconsider Context as a mandatory argument for the builders.

[AngusMorton]

Having Context as a required parameter to an email or share means that the resulting builder has a reference to the Application/Activity.

• This reference could cause leaks, depending on the user's use-case and usage.
• In some cases may not even be required.

It could be better to provide the context only when needed to avoid these issues.

This means the API might look something like:

Shelly.share()
    .text("shareText")
    .send(context);