Don't duplicate shims in PATH
tests for rbenv-init
replace tab with spaces
Merge pull request #367 from shoyan/master

replace tab with spaces
fix iterating through paths that have spaces in them

Fixes #344, #196
add tests for exec
fix exec fails for invalid version
hack around the hack around bash `echo`
test completions for exec
add tests for completions
improve detection of completion support for commands

Enable JavasCript, Lua and Erlang scripts to provide completions
Merge remote-tracking branch 'upstream/master' into develop

Conflicts:
	libexec/erlenv-commands
	libexec/erlenv-hooks
	libexec/erlenv-init
	libexec/erlenv-rehash
	libexec/rbenv-completions
	libexec/rbenv-exec
	libexec/rbenv-which
reintroduce arg forwarding test in exec
saner assertions for multiline output
simplify iterating through arglist
un-indent shebang for test executables
better emulate `ruby -S` behavior in testing

Per https://github.com/ruby/ruby/blob/7d3db3c/ruby.c#L1383-1391
add tests for rehash, whence, which
undo `assert_output_lines` in tests

It was a dumb idea and it wasn't even implemented perfectly.
add tests for version commands