context: Adding ib_context_get_context() to choose the best context.
lua: Remove per connection Lua stack to avoid thousands of parallel Lua stacks when Traffic Server is under load. Stacks are now obtained as needed and returned before the thread of control is returned to TrafficServer (or any other IronBee server container).
mod lua: Fixing state leak bug.
core: Avoid potential crash if tx->hostname is NULL.
copyright: Update copyright year to 2014.