Favor post-Gingerbread instantiation mechanism.

pre-Gingerbread is now a small subset of the Android OS distribution and is constantly shrinking toward zero.

git-svn-id: http://google-gson.googlecode.com/svn/trunk@1291 2534bb62-2c4b-0410-85e8-b5006b95c4ae
Correct TypeAdapterFactory reference in its Javadoc.

git-svn-id: http://google-gson.googlecode.com/svn/trunk@1292 2534bb62-2c4b-0410-85e8-b5006b95c4ae
Correct JsonElement javadoc exception references.

git-svn-id: http://google-gson.googlecode.com/svn/trunk@1293 2534bb62-2c4b-0410-85e8-b5006b95c4ae