[Migrate] migrate from maven to gradle
[Add] signing the apk
[Add] gradle task wrapper
[Add] link of javadocs for libs
[Modified]gradle script
[Modified] add mavenLocal()
[Modified] gradle scripts
[Modified] modify the license script
[Modified] gradle script
[Modified]modify gradle scripts
[Add]library androidannotations
[Modified]change the package name
[Add] third libs: menudrawer
[Add] third libs: menudrawer
[Update] update the menuAdapter
[Modified] MenuAdapter
[Add] DownloadTaskAdapter.java
[Modified] Debug