v1.1

• Added context support - mostly to facilitate debugging so that log messages can be correlated to specific requests.
• Fixed a gross locking issue where I was not using pointer receivers. So locking was happening across multiple instances instead of a single instance.
• Fixed a problem where the first (of multiple) incoming requests would invalidate an object and subsequent requests would still try to work with the invalidated structures. Added a minor layer of indirection so that a given URL could be locked.