rm man handling

[thepwagner]

Before #88 , ejson would fork to the man command for documentation.

Since we're using urfave/cli, we get some pretty good documentation in --help: maintaining these man pages separately is extra overhead.

Further, the hpricot transitive dependency we used for compiling the manpages was abandoned by the author 12 years ago: https://github.com/hpricot/hpricot/blob/master/README.md