维护
v2.1 改进分类器，更新模型
v2.1 改进分类器，更新模型
更新训练程序
已进行过测试，在conll09中文的UAS结果是83.50
Merge branch 'master' of https://github.com/xpqiu/fnlp
Merge remote-tracking branch 'upstream/master'

Conflicts:
	fnlp-core/src/main/java/org/fnlp/ml/classifier/linear/OnlineTrainer.java
	fnlp-core/src/main/java/org/fnlp/ml/classifier/linear/update/AbstractPAUpdate.java
	fnlp-core/src/main/java/org/fnlp/ml/classifier/linear/update/Update.java
	fnlp-core/src/main/java/org/fnlp/ml/classifier/struct/OnlineHybridTrainer.java
	fnlp-core/src/main/java/org/fnlp/ml/classifier/struct/OnlineStructTrainer.java
	fnlp-core/src/main/java/org/fnlp/ml/classifier/struct/update/HigherOrderViterbiPAUpdate.java