Bug XXX - pre: Fix typo in comment.
No bug - Make android-sync APK start an activity when deployed to device.

Android does not deliver broadcast intents to a package before the
user has "started" it (see
http://commonsware.com/blog/2011/07/13/boot-completed-regression-confirmed.html
for discussion).  During development, it is awkward to "start" the
android-sync APK.  This commit adds a dummy
`BackgroundDeveloperActivity` and registers it, so that on deploy (at
least from Eclipse) Android "starts" the android-sync APK
automatically.  This makes testing `BroadcastReceiver` instances
smooth.
No bug - Small fixes to AndroidManifest.xml.in.
Bug 828654 - Part 1: Factor reflecting-to-Fennec code into BackgroundService.

This also renames the label of the method reflected to Fennec in
anticipation of additional methods.
Bug 828654 - Part 2: WIP on HealthReportUpload*.