Add @NonNull annotation and configure Eclipse settings

This changeset adds a new @NonNull annotation, to match our existing
@Nullable annotation, and it adds configuration settings for Eclipse
3.8 / Eclipse 4.2 which configures the new null analysis there to use
our own annotations. Note that the annotations only have source
retention so there is no extra size or class-loading overhead. (To use
findbugs you'll need to temporarily change retention to class-level.)

In upcoming CL's I'll use these annotations to clarify the Lint API
and other APIs.

Change-Id: I99096d8b8a7e25ef002624d592da7700195a5872

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