Initial commit
Changes in the event handler.

Events are stored in array indexing by sockfd.
Ready events are stored as pointers.
ADD/MOD operations in rp_event_add function.
Some fixes.
Cross-platform I/O multiplexing support added

epoll, kqueue and select.
Ready events stored as rp_event_t structures again;
Some fixes.
Cross-platform compilation

Determination of OS and I/O multiplexing mechanism at compile time
via pre-defined compiler macros.
Some fixes.
Create LICENSE
Create README
Issue #1

Add docs to README
inline commands support