Tests for Parser / Document
Added FAQs
Chaining related changes

Also minor bug fix in rule test
Updated javadoc for missed case
Filter rule tests

TokenFilter tests for all except stemmer. Modified requirements to
capture chaining requirements
(Porter) Stemmer test
Tokenzier tests
TokenStream tests
Token tests
Indexer tests + bug fixes
Teeny-tiny fix
Merge pull request #1 from nicklondhe/master

Updated code