updated version and gitignore

Author: Amit Joshi

.gitignore

@@ -19,3 +19,5 @@ hs_err_pid*
 target
 .gradle
 build
+.idea/
+target/

build.gradle

@@ -32,8 +32,8 @@ if(hasProperty('target') && target == 'android') {
             targetSdkVersion 25
         }
         compileOptions {
-            sourceCompatibility JavaVersion.VERSION_1_7
-            targetCompatibility JavaVersion.VERSION_1_7
+            sourceCompatibility JavaVersion.VERSION_1_8
+            targetCompatibility JavaVersion.VERSION_1_8
         }
 
         // Rename the aar correctly
@@ -78,8 +78,8 @@ if(hasProperty('target') && target == 'android') {
     apply plugin: 'java'
     apply plugin: 'maven'
 
-    sourceCompatibility = JavaVersion.VERSION_1_7
-    targetCompatibility = JavaVersion.VERSION_1_7
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
 
     install {
         repositories.mavenInstaller {