Build with dependency on support-appcompat-v7.

Thanks to the awesome work of mvdan, this was mostly ready to roll.
However, I had to wrestle for a while for two reasons:

 1) I forgot to add the dependency in the build.gradle file (it was
    already present in settings.gradle)
 2) My IDE was unable to read the ANDROID_HOME env variable, and
    despite my internet-search-fu, I couldn't figure out how to
    make IntelliJ specify env variables for a gradle build. It took
    a while to figure out, because it was failing silently in weird
    ways.

After slaving away on a nice method to parse both the ANDROID_HOME
and the local.properties file (looking for sdk.dir), and then emmiting
nice error messages if neither were found or pointed to an invalid
location, I discovered it had already be done:

android.plugin.sdkDirectory ends up here:

https://android.googlesource.com/platform/tools/build/+/master/gradle/src/main/groovy/com/android/build/gradle/internal/Sdk.groovy#161

Which does exactly all that and more. So now sdkLoc is initialized to
the value of android.plugin.sdkDirectory.

AndroidManifest.xml

@@ -7,7 +7,7 @@
     android:versionName="0.69-test" >
 
     <uses-sdk
-        android:minSdkVersion="5"
+        android:minSdkVersion="7"
         android:targetSdkVersion="19" />
 
     <supports-screens

build.gradle

@@ -7,16 +7,18 @@ buildscript {
 	}
 }
 
-def toolVersion = "19.1"
 apply plugin: 'android'
 
-sdkLoc = System.getenv("ANDROID_HOME")
+def toolVersion = "19.1"
+sdkLoc = android.plugin.sdkDirectory
+
 FileCollection getAndroidPrebuilt(String apiLevel) {
 	files("$sdkLoc/platforms/android-$apiLevel/android.jar")
 }
 
 dependencies {
 	compile project(':support-v4')
+	compile project(':support-appcompat-v7')
 	compile project(':extern:AndroidPinning')
 	compile project(':extern:UniversalImageLoader:library')
 	compile project(':extern:MemorizingTrustManager')
@@ -137,4 +139,3 @@ subprojects {
 		}
 	}
 }
-