am 96f225af: am 4f82394a: am ee58d1bf: doc change: Add docs for SDK. Support new modular structure. In Android.mk, change @since level identifier to 5.xml, expose adt downloadable vars. Fix links that pointed to @sdkCurrent.

Merge commit '96f225afad61ee701dd84348e380a40ff8900fc0' into eclair-mr2-plus-aosp

* commit '96f225afad61ee701dd84348e380a40ff8900fc0':
  doc change: Add docs for SDK. Support new modular structure. In Android.mk, change @since level identifier to 5.xml, expose adt downloadable vars. Fix links that pointed to @sdkCurrent.