fix compatibility with android gradle plugin 0.14
gradle: 2.2.1-rc-1 wrapper jar and distribution url
gradle: fix demo build.gradle
gradle: compileSdkVersion 21

fixes broken import statements
demo: compileSdkVersion 21 (was 19)
Merge pull request #164 from talklittle/dev

gradle plugin 0.14.4 fixes
Correctly handle redirection when requesting manifests.