Revert "forcing a realclean to get rid of old libuv"

This reverts commit cf8088a28e894610309b0b7327de0d5b7dfcafb2.
Revert "update libuv from 0.11.18 to 0.11.29"

This reverts commit fce509b4fb59609bf14560043e382f5a0157c74f.
Revert "uv_fs_write also takes an uv_buf_t instead of char*"

This reverts commit 8a98741d24de403c20c4b32769cd4801a9cdcdd4.