…l is not writeable)
…ems on systems where /usr/local is read-only for users)
…ns in rebar.config will fail building release 0.4.0
This patch describes the `help` command and also changes the typography used in the command invocation section. The typography is altered to look more like a traditional man-page, where each flag is listed apart from the others. This makes for a more readable overview. Also use some horizontal rulers to separate the different command invocation types, further making it easier to read.