src/main/java/org/wltea/analyzer/core/LexemePath.java
Lexeme removeTail(){
		Lexeme tail = this.pollLast();
		if(this.isEmpty()){
			this.pathBegin = -1;
			this.pathEnd = -1;
			this.payloadLength = 0;			
		}else{		
			this.payloadLength -= tail.getLength();
			Lexeme newTail = this.peekLast();
			this.pathEnd = newTail.getBegin() + newTail.getLength();
		}
		return tail;
	}
Lexeme removeTail(){
		Lexeme tail = this.pollLast();
		if(this.isEmpty()){
			this.pathBegin = -1;
			this.pathEnd = -1;
			this.payloadLength = 0;			
		}else{		
			this.payloadLength -= tail.getLength();
			Lexeme newTail = this.peekLast();
			this.pathEnd = newTail.getBegin() + newTail.getLength();
		}
		return tail;
	}
移除尾部的Lexeme
@return