update .gitignore

ignore .classpath and .settings/

the following files are affected

	packages/EasterEgg/.settings/
        packages/SettingsLib/Color/.settings/
        packages/SettingsLib/Spa/.settings/
        packages/SystemUI/animation/.settings/
        startop/apps/ColorChanging/.settings/
        tests/HierarchyViewerTest/.settings/
        tests/TouchLatency/.settings/
        tests/TouchLatency/app/.classpath
        tests/TouchLatency/app/.settings/

Flag: EXEMPT gitignore update
Change-Id: Iaf7816d1b13ce80219594553fd683878fced70b3