- Updating Gradle project to > 1.0.0

- Updated .gitignore with Github ignore settings
- Updated build tools and SDK versions to 22
- Migrated .gradle files from pre-1.0.0 to post-1.0.0

usbSerialForAndroid/build.gradle

@@ -1,4 +1,4 @@
-apply plugin: 'android-library'
+apply plugin: 'com.android.library'
 apply plugin: 'maven'
 apply plugin: 'signing'
 
@@ -13,7 +13,7 @@ android {
 
     buildTypes {
         release {
-            runProguard false
+            minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
         }
     }