BeiderMorseEncoder OOM issues

In Lucene/Solr, we integrated this encoder into the latest release.

Our tests use a variety of random strings, and we have recent jenkins failures
from some input streams (of length <= 10), using huge amounts of memory (e.g. > 64MB),
resulting in OOM.

I've created a test case (length is 30 here) that will OOM with -Xmx256M.

I haven't dug into this much as to what's causing it, but I suspect there might be a bug
revolving around certain punctuation characters: we didn't see this happening until
we beefed up our random string generation to start producing "html-like" strings.