Update SDK/tool/dependency versions.

- recyclerview-v7
- appcompat-v7
- compile SDK
- build tools

library/build.gradle

@@ -1,8 +1,8 @@
 apply plugin: 'com.android.library'
 
 dependencies {
-    compile 'com.android.support:recyclerview-v7:22.2.0'
-    androidTestCompile ('com.android.support:appcompat-v7:21.0.2') {
+    compile 'com.android.support:recyclerview-v7:23.1.1'
+    androidTestCompile ('com.android.support:appcompat-v7:23.1.1') {
         exclude module: 'support-v4'
     }
     androidTestCompile ('com.nineoldandroids:library:2.4.0') {
@@ -11,8 +11,8 @@ dependencies {
 }
 
 android {
-    compileSdkVersion 21
-    buildToolsVersion "22.0.1"
+    compileSdkVersion 23
+    buildToolsVersion "23.0.2"
 
     defaultConfig {
         minSdkVersion 9

samples/build.gradle

@@ -8,7 +8,7 @@ apply plugin: 'com.android.application'
 //}
 
 dependencies {
-    compile 'com.android.support:appcompat-v7:22.1.1'
+    compile 'com.android.support:appcompat-v7:23.1.1'
     compile 'com.nineoldandroids:library:2.4.0'
     compile 'com.melnykov:floatingactionbutton:1.0.7'
     debugCompile project(':library')
@@ -23,8 +23,8 @@ apply from: "${rootDir}/gradle/version.gradle"
 project.ext.versionInfo.releaseVersionName = SYNCED_VERSION_NAME
 
 android {
-    compileSdkVersion 22
-    buildToolsVersion "22.0.1"
+    compileSdkVersion 23
+    buildToolsVersion "23.0.2"
 
     defaultConfig {
         applicationId "com.github.ksoichiro.android.observablescrollview.samples"