Raised Java language compatibility

Author: smarek

library/build.gradle

@@ -14,6 +14,11 @@ android {
     lintOptions {
         abortOnError false
     }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_7
+        targetCompatibility JavaVersion.VERSION_1_7
+    }
 }
 
 android.libraryVariants.all { variant ->

sample/build.gradle

@@ -24,6 +24,11 @@ android {
         targetSdkVersion 19
     }
 
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_7
+        targetCompatibility JavaVersion.VERSION_1_7
+    }
+
     lintOptions {
         abortOnError false
     }