unix: unref fs event watcher

Watchers were being ref-counted twice which wasn't harmful in itself but stopped
uv_unref() from working like you'd expect it to.

windows: uv_fs_rename to replace the new file if it exists
fixes #283

windows: ensure that uv_fs_event callbacks have long names

docs: add c-ares license note

unix: it's legal for dlsym() to return NULL

A symbol name can map to NULL. Check dlerror() to see if a real error happened.

unix: the dl functions don't set errno

linux: detect if inotify syscalls are supported

linux: improve kernel feature detection

Do not check for minimum kernel and glibc versions, just check that the kernel
headers export the syscall number and invoke the syscall directly.

linux: improve kernel feature detection

Do not check for minimum kernel and glibc versions, just check that the kernel
headers export the syscall number and invoke the syscall directly. Effectively
bypasses glibc.

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windows: correctly check the result of malloc

windows: fix memory leak when non-zero tcp reads are used

Fix missing increments of loop->counters

.gitignore core and vgcore files.

Update AUTHORS and .mailmap

doc: add Travis CI build status image

test: add `.travis.yml` for testing on Travis CI

test: make test runner return non-zero in case of failure

unix: fix warning: return 0 in function returning void

unix: check UV_CLOSING flag in uv__write()

uv__write() runs after the read callbacks have fired. Said callbacks may have
closed the handle, handle that graciously.

unix: make it safe to delete the default loop

Fixes a potential free() of non-malloc'ed memory.

unix: translate ETIMEDOUT to UV_ETIMEDOUT

windows: enable pending pipe instances knob

Win: utf-8 decoder bug when compiling with gcc

Fix MinGW and MinGW-w64 builds

Win: lower case tlhelp32.h to support cross compilation

uv_cwd + uv_chdir