Add Stripe-Webserver-Component

Not core Stripe functionality:

* emailcollector.py:  functionality migrated out of "devpaycomplete" module
which was removed
* handlers/main.py :  functionality common to mutiple handlers, also migrated out of "devpaycomplete" removed module
* lae_site/main.py:  enhanced logging, proper (Stripe-not-devpay) names

Core Stripe functionality:
(1) submit_subscription.py:
    -- function 'start':  Sets up flappservice as a global variable during webserver startup
    -- SubmitSubscriptionHandler:
       (1) Sets up logging bound to the module and Class "SubmitSubscriptionHandler"
       (2) Receives an HTTP message as result of $form.get(0).submit:
          line 45 subscription_signup.js
       (3) Parses arguments out using "get_arg":
          line 41 handlers/main.py
       (4) Uses UID from Stripe bound to a customer credit card: line 44
           AND
           Our Private Stripe API Key: line 50
           to create a customer object in the stripe DB and subscribe that
           customer to our S4 plan:  line 54
       (5) Upon an exception renders the subscription form and returns it to the browser
       (6) Appends new customer-subscription-to-plan UID to a local (webserver) log: line 64
       (7) Ensures data is ascii/JSON: line 81
       (7.1) Registers callbacks
       (8) Sends the data to the provisioning service (async): line 89
       (9) Renders a "payment verified" html and sends that to the browser

(2) templates/payment_verified.html:  HTML which is sent to the browser.  Text informs the User that
their card was successfully processed and the service is being created.