added 1.3 repl docs
removed whitespace from nav file

I wasn't sure if it would blow up YAML etc
fixes per @lordnull's review
Correcting default in text.
tweaked "masterless."
Mark old MDC as legacy
Merge branch 'dip_repl13' of github.com:basho/basho_docs into dip_repl13
Distinguish between default and BNW
Merge pull request #180 from basho/dip_repl13

added 1.3 repl docs