Use thread local for with(scope) blocks
Add asserts for not applied caller string
Add locking around hooks and applied structures
A thread safety as README feature
Merge branch 'dev' into thread-safe
Add test_threaded_with

This fails against the current dev branch parent (without thread-safe
branch).
Merge branch 'thread-safe-test' into thread-safe
Bump to 1.1.0
Merge branch 'thread-safe' into dev
History for merge, release date