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- should not be on init, because need debug flag

+ added recursive pinning func

See https://github.com/atom/atom/issues/3660

Removed config.Filename and replace it with config.GetConfigFilePath that
takes a configuration directory as argument instead. Makes code simpler.
ipfs.getConfigDir now also return the default configuration dir instead of
an empty string in some cases.

WARNING: change breaks old configs.
@whyrusleeping @perfmode

This commit changes the way addresses are stored in config files.
It lumps Identity.Address and RPCAddress into Addresses. This
commit also fixes several golint issues.

There are (so far) two sorts of addresses that peers care about:

- peer network addresses, local to listen, saved to bootstrap.
  `config.Identity.Address`

- peer RPC network address, local RPC tcp endpoint
  `config.RPCAddress`

@whyrusleeping @perfmode

In the future, let's have a (signed) list of bootstrap
nodes. Ideally just a list of ipfs multiaddrs (with node.ID)