[#MmLRZ2E2] address review feedback

namespace module name with "blocks-", update alerter dependency to npm repo instead of github, remove global option from hbsfy transform, remove unnecessary code, update Events test to just test if object has emit method since specific events are tested elsewhere, update custom template test to check that the custom template is used and not just the default, change test API keys to be fake keys, update README by adding better examples and remove duplicate prependMessagesTo docs

Branch: MmLRZ2E2-development
Merge branch 'MmLRZ2E2-development' of https://github.com/blocks/subscribe-email into MmLRZ2E2-development