Init libkeychain and move some utils

libkeychain/build.gradle

@@ -0,0 +1,40 @@
+apply plugin: 'com.android.library'
+
+dependencies {
+    // NOTE: Always use fixed version codes not dynamic ones, e.g. 0.7.3 instead of 0.7.+, see README for more information
+    // NOTE: libraries are pinned to a specific build, see below
+
+    // from local Android SDK
+    compile 'com.android.support:support-v4:25.0.1'
+
+    // libs as submodules
+    compile project(':openpgp-api-lib') // TODO: get rid of this dependency
+    compile project(':extern:bouncycastle:core')
+    compile project(':extern:bouncycastle:pg')
+    compile project(':extern:bouncycastle:prov')
+
+    // Unit tests in the local JVM with Robolectric
+    // https://developer.android.com/training/testing/unit-testing/local-unit-tests.html
+    // http://robolectric.org/getting-started/
+    // http://www.vogella.com/tutorials/Robolectric/article.html
+    testCompile 'junit:junit:4.12'
+    testCompile ('org.robolectric:robolectric:3.2.2') {
+        exclude group: 'org.bouncycastle', module: 'bcprov-jdk16'
+    }
+    testCompile 'org.mockito:mockito-core:1.10.19'
+
+}
+
+android {
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
+
+    defaultConfig {
+        minSdkVersion 14
+    }
+
+    // Do not abort build if lint finds errors
+    lintOptions {
+        abortOnError false
+    }
+}