add operator* to thread_cached<>
reduce malloc count with vector<> of stacks
using using (trivial)
ensure fd is not leaked if task::spawn throws any exception
Much smarter stack cache, with larger defaults.  Makes stack_allocator a namespace.
control init ordering for set_default_stacksize()
store signal stack addr so valgrind doesn't think it's leaked
Merge pull request #66 from chipdude/chip/stacks

Much smarter stack cache, with larger defaults.