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
update xsoup version to release #113
Bugfix:Type convert error in JsonPathSelector #129
Merge pull request #128 from yxssfxwzy/proxy

多个代理的管理
spell mistake fix #128
change return proxy from spider to httpclientdownloader #128
change back return proxy from spider to httpclientdownloader #128
Bugfix: selector does not works well in element #113
update pom for deploy
update pom
update pom