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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.