Merge pull request #46 from gyk001/master

2.0.9 发布
palceholder bug
genenral tag bindding
tag binding2, functionwrapper call bug fix
doc
resourceloader varbindding
标签不存在提示，html标签绑定争强，虚拟属性未定义提示，反射调用bug，输出float的bug
add getAttributeValue
Merge remote-tracking branch 'remotes/origin/develop'
remove stringutils
Merge remote-tracking branch 'remotes/origin/develop'
simple test
test
同步锁
Merge branch 'master' of https://github.com/javamonkey/beetl2.0