ThaiAnalyzer fail to tokenize word. [LUCENE-4253]

Method
protected TokenStreamComponents createComponents(String,Reader)

return a component that unable to tokenize Thai word.
The current return statement is:
return new TokenStreamComponents(source, new StopFilter(matchVersion, result, stopwords));

My experiment is change the return statement to:
return new TokenStreamComponents(source, result);

It give me a correct result.

---
Migrated from [LUCENE-4253](https://issues.apache.org/jira/browse/LUCENE-4253) by Nattapong Sirilappanich, updated Jul 30 2012
Environment:
```
Windows 7 SP1.
Java 1.7.0-b147
```

Start at ThaiAnalyzer's createComponents(String, Reader) method and inspect how StopFilter affects the returned TokenStreamComponents. Reproduce the reported Thai-word tokenization result, then confirm the intended stopword behavior and add or update a regression test so the expected tokens are preserved.

Written by the indexing model from the issue text.