Add Travis CI support

travis/linux..before_install

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+#!/bin/sh
+sudo apt-get update -qq

travis/linux..install

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+#!/bin/sh
+sudo apt-get install -y \
+	android-sdk \
+	android-sdk-platform-23 \
+	apksigner \
+	default-jdk-headless \
+	gettext \
+	gradle \
+	libgradle-android-plugin-java

travis/linux..script

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+#!/bin/sh
+set -e
+
+cd AndorsTrail
+
+ln -s ../travis/support/build.gradle ../travis/support/gradle.properties \
+	../travis/support/local.properties .
+
+mkdir -p src/main/assets/translation src/main/java
+ln -s ../../AndroidManifest.xml ../../res src/main
+ln -s ../../com src/main/java
+
+for po in assets/translation/*.po
+do
+	msgfmt -o src/main/${po%.po}.mo $po
+done
+
+gradle assembleRelease
+
+keytool -genkeypair -v -keystore keystore.p12 -storepass changeit \
+	-keypass changeit -storetype pkcs12 -alias self -keyalg RSA \
+	-validity 10000 -dname \
+	"CN=Unknown, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown"
+
+VERSION=$(grep android:versionCode AndroidManifest.xml | cut -d \" -f 2)
+APK=com.gpl.rpg.AndorsTrail_$VERSION.apk
+
+apksigner sign --out $APK -v --ks keystore.p12 --ks-pass pass:changeit \
+	build/outputs/apk/AndorsTrail-release-unsigned.apk
+apksigner verify $APK

travis/support/build.gradle

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+buildscript {
+    repositories {
+        maven { url "file:///usr/share/maven-repo" }
+    }
+
+    dependencies {
+        classpath "com.android.tools.build:gradle:debian"
+    }
+}
+
+apply plugin: "com.android.application"
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion "24.0.0"
+}
+
+dependencies {
+    compile files("libs/android-support-v4.jar")
+}

travis/support/gradle.properties

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+android.disableResourceValidation=true

travis/support/local.properties

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+sdk.dir=/usr/lib/android-sdk