BaseRecyclerViewAdapterHelper

根据简书上陈玉明的文章《RecyclerView.Adapter优化了吗？》中的代码做了一些修改，这个adapter实现了传统的下拉刷新样式

Name		Name	Last commit message	Last commit date
Latest commit History 2 Commits
app		app
demo_res		demo_res
gradle/wrapper		gradle/wrapper
library		library
material-spinner-1.0.5		material-spinner-1.0.5
README-cn.md		README-cn.md
README.md		README.md
build.gradle		build.gradle
gradle.properties		gradle.properties
gradlew		gradlew
gradlew.bat		gradlew.bat
settings.gradle		settings.gradle

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