fixed several potential nullptrs

code cleanups
logging enhancements (memory/cpu)
reduced log footprint (diskspace)
fixed some potential layout issues
added comments

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.0'
+        classpath 'com.android.tools.build:gradle:2.2.0-alpha2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files