GWS.GMAIL.13.1v0.1 Policy Changes

[jkaufman-mitre]

Policy re-evaluation post 0.2 release

Possibly taking "to avoid unintentional replies and remind users to treat external messages with caution" out of the policy statement itself; the rationale covers the reasoning; and we want the policy statements to be as concise as possible.

[jkaufman-mitre]

Branch was created and changes were made. Waiting until the release of version 0.2 of the baselines before creating PR. Changes made in "gmail-changes-post-0.2"

[jkaufman-mitre]

PR has been created. Handled under PR 310. Moving this to in review.