big change: rename ISegment-> SegmentInterface && add SegmentBase as the *segment's base class
add filter for recognize the chineseword ,and filter  digital or something
filter not finished at last commit , now finished it and run ok.
完善对于英文数字和标点符号的分词，'我来自北京邮电大学。。。学号091111xx。。。' 结果可分为: '我/来自/北京邮电大学/。。。/学号/091111xx/。。。'
Merge branch 'dev'