improved thread pool and added unittests
unittests for thread pool coverage -> 97%
updated README
release 2.1.0
updated doc
spawn new threads one by one instead of all at same time
release 2.1.1
small test fix
release 2.1.2
repare process for pool
release 2.1.3
added ThreadPool class with context manager, missing unittests
thread unittest coverage -> 99%
updated README and docs
added join, close and stop methods, improved __exit__ method, worker is now a Class
removed unused import
removed queue setter/getter from decorator
fix docs and README
thread unittests -> 99%
updated docs