Move the API into a subdirectory for ease of imports.

Previously, if users of our code put the API folder in their pyshared
they would have to import it as "humbug.humbug". By moving Humbug's API
into a directory named "humbug" and moving the API into __init__, you
can just "import humbug".

(imported from commit 1d2654ae57f8ecbbfe76559de267ec4889708ee8)

api/examples/curl-examples

@@ -1,14 +0,0 @@
-#!/bin/sh
-# Two quick API tests using curl
-
-curl https://humbughq.com/api/v1/send_message \
-    -d "api-key=YOUR_API_KEY" \
-    -d "email=YOUR_EMAIL" \
-    -d "type=private" -d "content=test" \
-    -d "to=RECIPIENT_EMAIL"
-
-curl https://humbughq.com/api/v1/get_messages \
-    -d "api-key=YOUR_API_KEY" \
-    -d "email=YOUR_EMAIL"
-
-# Or replace https://humbughq.com with your local test instance