Fix sending multipart bodies through SocketChannel #390
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As per documentation, selector.select() returns only keys that have
updated and therefore even if it return zero, it doesn't mean that
selectedKeys wouldn't contain keys that are writable.
See http://stackoverflow.com/questions/9939989/java-nio-selector-select-returns-0-although-channels-are-ready and http://docs.oracle.com/javase/7/docs/api/java/nio/channels/Selector.html#select() for more details.
This commit utilizes the same maxSpin already used in FileChannel case
for detecting that writing has stuck somewhere. A configurable
timeout for select would be the obvious better solution.