Key may be quoted

[towo]

The lens assumed an unquoted word-like key, while it may be unquoted.

Technically, according to the
spec,
it even allows for a few more non-word chars.

Test not adjusted (yet) because the format confused me.

[towo]

Weirdly enough, augmatch is also giving the output keys unquoted whilst augtool is giving the output keys quoted, which affects matching. This also applies to the current master version, so no changes from my side.

[georgehansper]

This change fails testing with the message:

Syntax error in lens definition
/home/george/github/augeas/lenses/toml.aug:125.0-126.88:Failed to compile entry
/home/george/github/augeas/lenses/toml.aug:125.44-.70:exception: overlapping lenses in tree union.put
    Example matched by both: 
    First lens: /home/george/github/augeas/lenses/toml.aug:122.17-.60:
    Second lens: /home/george/github/augeas/lenses/toml.aug:123.19-.32:

I would also suggest that, if the Toml lens is to support quoted keys, too, then this should be included in a test-case.