Change gradle build for spongy castle, now Android Studio properly finds the classes

libraries/spongycastle/core/build.gradle

@@ -0,0 +1,12 @@
+apply plugin: 'java'
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+}
+
+sourceCompatibility = 1.5
+targetCompatibility = 1.5
+version = '1.50.0.0'
+
+// skip tests
+build.dependsOn.remove("check")

libraries/spongycastle/pg/build.gradle

@@ -0,0 +1,14 @@
+apply plugin: 'java'
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+    compile project(':libraries:spongycastle:core')
+    compile project(':libraries:spongycastle:prov')
+}
+
+sourceCompatibility = 1.5
+targetCompatibility = 1.5
+version = '1.50.0.0'
+
+// skip tests
+build.dependsOn.remove("check")

libraries/spongycastle/pkix/build.gradle

@@ -0,0 +1,14 @@
+apply plugin: 'java'
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+    compile project(':libraries:spongycastle:core')
+    compile project(':libraries:spongycastle:prov')
+}
+
+sourceCompatibility = 1.5
+targetCompatibility = 1.5
+version = '1.50.0.0'
+
+// skip tests
+build.dependsOn.remove("check")

libraries/spongycastle/prov/build.gradle

@@ -0,0 +1,13 @@
+apply plugin: 'java'
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+    compile project(':libraries:spongycastle:core')
+}
+
+sourceCompatibility = 1.5
+targetCompatibility = 1.5
+version = '1.50.0.0'
+
+// skip tests
+build.dependsOn.remove("check")