Fixed a bug regarding reading data.

When reading stream and survey data, the start and end dates were not being properly sanitized.
Added the updated EasyPost.

This is not complete, but it comes with authorization and stream and survey APIs.

Some next steps include:

* Add the schema APIs, which should be nearly identical.
* Add the media APIs.
* Add the user APIs.
* Add the ohmlet APIs.
* Add the OAuth APIs.
* Add the Open mHealth APIs.

Some tasks that need to be approached are:

* Getting the iframe to fill the page (or, optimally) dynamically resize with the size of the result.
* Figuring out how to handle uploading files (e.g. icons, media for prompt responses).

References #690