Add support for allowDashes

[jeremyhansonfinger]

Problem

We want retext-shopify, which is based on retext-simplify, not to strip out hyphens when performing matches. For instance, we want to be able to tell people that drop-down menu is the preferred spelling, rather than drop down menu or dropdown menu.

Solution

We added the ability to set allowDashes value (see syntax-tree/nlcst-normalize#1 ) when calling the search() function.

Notes

As in syntax-tree/nlcst-normalize#1, Dave notes that the test coverage may be excessive, but since he used these tests to resolve the problem I was having, he left them in there.

[jeremyhansonfinger]

Travis CI won't pass unless the corresponding changes are merged into nlcst-normalize. @admhlt

[wooorm]

Thanks a lot y’all!

[wooorm]

Thanks both, released!

[jeremyhansonfinger]

Great! Thanks again.