libuEv v2.1.0

Changes

• Remove event loop error tracking used to trigger a epoll_create1() at a certain error threshold. This tracking was first introduced in [v1.1.0][], triggered by spurious EPOLLERR on I/O watchers
• Unconditionally stop I/O watchers that return EPOLLERR or EPOLLHUP, it is up to the watcher callback to clear the error and/or read() the last few bytes from the descriptor. HUP usally means EOF, or that the remote end of a stream or pipe closed, this may also be signaled by read() returning zero
• Add missing --enable-examples to configure script
• Update documentation, both README.md and API.md

Fixes

• Properly stop and de-register signal and cron/timer watchers from the epoll socket in case of errors, problem introduced in v2.0.0
• Mark watcher file descriptor as unintialized on internal error
• Fix double-close of cron/timer watchers. Problem triggered when the timer expires and calls uev_exit(), which stops all watchers. When the timer callback returns another call to stop the watcher triggered the double close()
• Fix unit test's error handling in watcher callbacks, for reference
• Fix use-before-set in cronrun unit test
• Make sure to restart unit test's I/O watchers on UEV_ERROR
• Make sure to restart example I/O watchers on UEV_ERROR
• Properly check for UEV_HUP in unit tests and examples