Add an OSX LaunchAgent plist

Fix/dial error hiding

`launchd` doesn't allow you to *use* environment variables. Nor does it support
tilde-expansion of program names & arguments after OSX 10.10.

To work around this, I've made the plist file a template and included a small
install script that will interpolate the correct values.

I found this useful to have, and figured it might save somebody else a
few minutes of re-inventing the wheel.

advertise multiple addresses over mdns

use => Use

Eventlog: revert lumberjack fork

Fixes https://github.com/ipfs/ipfs/issues/67

hotfix: dont use nodes context because it might not be set yet

eventlog: buffer writes before pushing them to lumberjack - same effect, no upstream changes. Thx @natefinch!

This reverts commit 7055d769.

Godeps maintenance

use forked lumberjack (buffers writes)

Change ipfs root path volume mount to /data/ipfs

add a benchmark for our hash function

Fix docker $ipfs_data mount path in README

blocks: Don't re-Put blocks we already have

Commit 1192be19 tried to do this, but
had a simple mistake. Functions returning `bool, error` pretty much
never return `true, anError`, so that branch was never taken.

Also fix the partial sentence in the

core/commands: pin ls: display types by default

If you want to get only the hashes (i.e. the previous behaviour), you can use
the `--quiet` flag.

the godep tool is toying with me...

I want to follow this up with a thorough execution of my x/tool/cmd/eg experiments (https://github.com/ipfs/go-ipfs/compare/errRampage)

let wantlist command show other peers wantlists

only warn about io.EOF from mux.ReaderHeaders (fixes #1143)