update version to snapshot
interface of PageMapper #120
implementation of PageMapper #120
add charset to Writer
Update FilePipeline.java
Merge pull request #121 from ywooer/master

创建指定编码的Writer
Update JsonFilePipeline.java

JsonFilePipeline可以自动新建尚不存在的文件夹
auto create folder in JsonFilePipeline #122
Merge pull request #123 from gsh199449/master

Update JsonFilePipeline.java #122
Ignore content in json when bracket when remove padding #124
增加处理meta的逻辑。
遗留：
3、网页没有指定编码的情况下，需要采用cpdetector，但目前cpdetector这个在Maven的中央库里面没有，不清楚如何解决。
修改自动从网页中获取字符的代码块，抽取出来成为单独的方法。
remove cpdetector temporary #126
change_gitignore
add proxy pool
Enhance auto charset detect #126
1. Only read from content once to fix stream closed exception
2. invite moco as server test
refactor selectable for html fragment #113
refactor of selectable cont' #113
1. remove lazy init of Html
2. rename strings to sourceTexts for better meaning
3. make getSourceTexts abstract and DO NOT always store strings
4. instead store parsed elements of document in HtmlNode
Bugfix: nodes() only return the first element #113
fix ut #113