Converted ShatteredPD to Build from Gradle

Major Changes:
- Shattered now builds effortlessly either from gradle CLI or android studio
- Much better dependency management through gradle (although it's not really used atm)
- Separate PD-classes repo is now SPD-classes module within main repo

gradle.properties

@@ -0,0 +1,3 @@
+org.gradle.daemon=true
+org.gradle.jvmargs=-Xms128m -Xmx1024m
+org.gradle.configureondemand=true