Update gradle and add kotlin support

app/build.gradle

@@ -7,6 +7,13 @@
  */
 
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-kapt'
+
+kapt {
+    generateStubs = true
+}
 
 android {
     compileSdkVersion 27
@@ -133,6 +140,7 @@ dependencies {
     compile 'io.requery:requery-android:1.5.0'
     compile 'io.requery:requery-kotlin:1.5.0'
     annotationProcessor 'io.requery:requery-processor:1.5.0'
+    kapt 'io.requery:requery-processor:1.5.0'
 
     compile group: 'com.madgag.spongycastle', name: 'core', version: '1.54.0.0'
     compile group: 'com.madgag.spongycastle', name: 'prov', version: '1.54.0.0'

build.gradle

@@ -8,12 +8,15 @@
 
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
+    ext.kotlin_version = '1.2.20'
+
     repositories {
         jcenter()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.0'
+        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 

cert4android

@@ -1 +1 @@
-Subproject commit e8a95719e581749997614d614cb6bf36d43fd7b7
+Subproject commit 90fcdc8532a277dfdf8f3f6451a21b3fa5b49e0b

ical4android

@@ -1 +1 @@
-Subproject commit 92ff8d06148737bb35e5ace9a9538943f9bdc81f
+Subproject commit 532d4fcd02ba3a398dcdfdcd1118fb66880b25b8

vcard4android

@@ -1 +1 @@
-Subproject commit 42825421c620ec01256f4d3a00030aabe64efca8
+Subproject commit d5f7d31887c68a47af3df491f5dca1f307144bf9