Reenable strict mode so that shell gives helpful messages for unknown…

[janedegtiareva]

… commands

[janedegtiareva]

fix for #50, which is a regression

[vgrichina]

AFAIK, this will break near-shell for cases when config is present, but given command doesn't accept all of the options in config.

[ilblackdragon]

@janedegtiareva can we define strict only on the top commands? e.g. near blah fails but not near send --blah=whatever?

[janedegtiareva]

We can add all the config options to shell and expect no unrecognized config options. Opinions?

[mikedotexe]

We can add all the config options to shell and expect no unrecognized config options. Opinions?

This is essentially the approach I took here:
#262

Plus some other fun snags to work through.