Updated package names in several examples' READMEs

Change-Id: I2d3ee6bfe9a8953c0d1a25a51ada12c1586d9dab
Added test to ExceptionMapperTest

Change-Id: Icfb49d5630828797c874c49f14a67d511e5d7cec
Merge "Added test to ExceptionMapperTest"
Merge "Updated package names in several examples' READMEs"