Android samples should attach source jars

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Read this for details:
http://www.alittlemadness.com/2012/07/02/android-attaching-sources-to-libraries-
in-eclipse/

short story is that we need to add a libsources folder with the source jars, 
and then in the libs folder, for each foo.jar, we need to add a 
foo.jar.properties that looks like this:

src=libsources/foo-sources.jar

Note that it required ADT release 20.  I haven't tried it yet, but it comes 
directly from Xavier Ducrohet who is the Android SDK tech lead so it should 
probably work :)

Original issue reported on code.google.com by yan...@google.com on 9 Jul 2012 at 1:34

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Original comment by yan...@google.com on 14 Jul 2012 at 11:17

• Changed state: Accepted

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http://codereview.appspot.com/6452071/

Original comment by yan...@google.com on 31 Jul 2012 at 7:38

• Changed state: Started

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Original comment by yan...@google.com on 1 Aug 2012 at 4:29

• Changed state: Fixed