doc: dgram: reword dgram.Socket#send() docs

Make it clear that the address argument is not really optional and fix
some Engrish and long lines while we're here.

Fixes #6433.
blog: Post for v0.11.8
doc: document node signal handling

Partly lifted from uv.h, partly from observation of node.cc.
doc: Correct and add several items

Several names/urls were out of date, and some really
awesome stuff was missing.
doc: encoding is ignored if input is a Buffer

NOTE: it wasn't in 0.8

fixes #6386
npm: Upgrade to 1.3.14
Merge remote-tracking branch 'ry/v0.10'