Restructure API lib folder to support Eclipse

OpenPGP-Keychain-API/libraries/keychain-api-library/AndroidManifest.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.sufficientlysecure.keychain.api"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk
+        android:minSdkVersion="9"
+        android:targetSdkVersion="19" />
+
+    <application/>
+
+</manifest>