Link to external library projects instead of hard-coding jars

For bettery transparency and version control. To compile GravityBox in
Eclipse, it is now necessary to fetch linked library projects into the
same workspace.

Author: C3C0

.classpath

@@ -6,5 +6,6 @@
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="src" path="gen"/>
 	<classpathentry kind="lib" path="ext/api-82.jar" sourcepath="ext/api-82-sources.jar"/>
+	<classpathentry combineaccessrules="false" kind="src" path="/android-support-v7-palette"/>
 	<classpathentry kind="output" path="bin/classes"/>
 </classpath>

libs/support-annotations.jar

@@ -13,3 +13,4 @@
 # Project target.
 target=android-27
 sdk.buildtools=25.0.3
+android.library.reference.1=../android-support-v7-palette