README: add syntax highlighting to code snippets
GH-3: optional -h/--help regexp arg to find in man

The `-h` and `--help` options in `BinMan.help()` can now be optionally
followed by a regular expression argument that specifies text to search
for and, if found, jump to inside the displayed UNIX man page.  Such a
regular expression argument can now also be passed into `BinMan.show()`.
Merge branch 'other'
Merge branch 'minor'
Version 3.4.0 (2014-06-29)