new module "brilltagger"
new module "tagger"

For basic tagger infrastructure. Other taggers (besides
BrillTagger) maybe implemented over the same interfaces.
basic concepts: Text, Sentence, Token, Tagger
empty brilltagger over empty text
default implementations of basic concepts

Using ArrayList and HashMap as base implementations of List
and Map interfaces.
simplistic test case (Roche and Schabes 1995)

Mainly adds test case infrastructure.
brill rules

Basic building methods and a very economic addressing
scheme.
token addressing scheme using bitwise operations

They are about 50% faster than the arithmetic versions,
though somewhat cryptic.
straight forward implementation of brill tagger
Merge branch 'feature/basicBrillTagger' into develop