Adding support for match functions in select phase.

[markgardner]

Hi,

I ran into the problem that completer.js allowed strategy.match to be a function but the textarea components did not. My purposed changes shouldn't effect usages that are plain regex but should allow strategy.match to work as expected when defined as a function.

Let me know if you have any concerns, thank you.

[yuku]

Hi @markgardner, thanks for sending the patch! Please check my comments.

[markgardner]

@yuku-t Updated the PR to match your comments

[yuku]

I've released v1.6.2 with the patch. Thanks for your contribution 😄