Revert "respect verify_requests"

This reverts commit 57cd926e0dde038819996b807bd602efd68bcfb5.
Revert "Use OAuth1Session in PyPump.request_access()"

This reverts commit 322cc513a3cacbd8401e622b3524dd5d2f2fde89.
Revert "Use OAuth1Session in PyPump.request_token()"

This reverts commit 30586360870e530b3dcdb56432b62e04af45858b.