DOCS: Updated FUSE docs

Add additional link manipulation functions

Add hamming distance calculation to bloom filters

add more bitswap task workers

changed IPFS_TASK_WORKERS to IPFS_BITSWAP_TASK_WORKERS

increase window size for yamux streams

// AddRawLink adds a link to this node
AddRawLink(name string, lnk *Link) error

// Return a copy of the link with given name
GetNodeLink(name string) (*Link, error)

README: alpha version has been released

move log messages out of warning level

secio: better error detection

The same keys + nonces in secio were being observed. As described in
https://github.com/ipfs/go-ipfs/issues/1016 -- the handshake must
be talking to itself. This can happen in an outgoing TCP dial with
REUSEPORT on to the same address.

Fixed broken http link in README.md

Markdown didn't have "http://" so the link returned 404

Fix hub.docker.com URL

Added documentation for docker usage. 

log listeners dying as at least a warning

fix ugly error message when killing commands

Publish by path

updated goprocess to deal with memory leak

bugfix: add was not setting error

corehttp: added support for HEAD requests

This commit adds HEAD support to the IPFS Gateway.
Related: #840