Added the 3 types of referrals notifications (referral_ping/referral_pending/referral_complete) to the push notifications template.

To test:

• Use a referral link (e.g. https://www.minds.com/register?referrer=myTestReferrer) to create a new user (e.g. @myTestProspect). @myTestReferrer should get a referral_pending notification.
• When logged in as @myTestReferrer, go to the referrals console, scroll down to the "My Referrals" table and click the "Ping" button next to @myTestProspect. Log in as @myTestProspect to see the referral_ping notification.
• When logged in as @myTestProspect, join the rewards program by creating a Minds wallet. Log in as @myTestReferrer to see the referral_complete notification.

changed milestone to %Misc. Q4 2019

added scoped labels

added 1 commit

• bd62fd4a - (chore): consistent capitalization for Pro (not PRO)

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