Downgrade minSdkVersion to 7 to run on Nook Simple Touch

Also, disable lint abortOnError so the build completes despite
getActionBar().setDisplayHomeAsUpEnabled(true) calls (properly protected
by conditions on the API version in the code).

fixes: wallabag/android-app#25

Signed-off-by: Olivier Mehani <shtrom@ssji.net>

app/build.gradle

@@ -6,7 +6,7 @@ android {
 
     defaultConfig {
         applicationId "fr.gaulupeau.apps.InThePoche"
-        minSdkVersion 8
+        minSdkVersion 7
         targetSdkVersion 21
         versionCode 10
         versionName "1.7"
@@ -17,6 +17,9 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    lintOptions {
+	    abortOnError false
+    }
 }
 
 dependencies {