examples update
Merge branch 'master' of https://github.com/kissygalleryteam/kcharts into dev-1.2
添加legend的文档
添加斜向标注的label示例
demo update
Merge branch 'master' of https://github.com/kissygalleryteam/kcharts into dev-1.2
label斜着标注的barchart
Merge pull request #55 from WeweTom/master

legend文档以及demo 更新