Clarify header of nrepl autoload file
Extract classpath.vim to a separate plugin

Keeping it in the repository, for now.  Disable it with

	let g:no_foreplay_classpath = 1

This eliminates the startup delay at the cost of requiring a REPL to
evaluate code.

References #3.
Add option of using if_python if if_ruby is not available
Update documentation to reflect Python addition
Remove specialized shell escape function

The cases this was guarding against aren't actually relevant any more.
merged with upstream