version: now working on 1.0.0-rc3
Use a lock on UVHelper.
Use a readahead cache to reduce individual reads.

Maybe should just have output deal with breaking into chunks and read
faster...
Show an error if you specify too many inputs.
Avoid a possible problem from compiler optims.
windows: fix fs_read with nbufs > 1 and offset too

Should not have made assumptions from the existing code and MSDN
documentation, ReadFile() does not seem to update the offset at all.
Merge branch 'fsread-fix' of https://github.com/unknownbrackets/libuv into helper-lock
Add support for reading DAX files.

Not super efficient, but functional at least.