Fix compilation issues HashMap.Entry isn't public.

Need to use Map.Entry instead of HashMap.Entry in order for this to
compile.
Merge pull request #2 from kingargyle/fix-HashMap-issue

Fix compilation issues HashMap.Entry isn't public.
Update README.md
Update README.md
Merge branch 'master' of https://github.com/cartland/androidtv-Leanback
Fixed background image issue in LeanbackDetailsFragment.java
Updated AndroidManifest to include Leanback feature
Updated name in README

Change-Id: Iac18b2809f1d51395b64e1a9f9ef868947c98a34