Update .gitignore, Replace libs with hosted repositories

.gitignore

@@ -50,3 +50,9 @@ shell/linux/nosym-reicast.elf
 shell/linux/reicast.elf
 
 reicast-ios.xccheckout
+
+# Android Studio
+.gradle
+.idea
+*.iml
+.externalNativeBuild

shell/android-studio/app/build.gradle

@@ -32,13 +32,14 @@ android {
 
 dependencies {
     compile 'com.android.support:support-v4:25.3.1'
-    compile files('libs/bcprov-jdk16-146.jar')
+    compile 'org.bouncycastle:bcprov-jdk16:1.46'
     compile files('libs/com.bda.controller.jar')
-    compile files('libs/commons-io-2.4.jar')
-    compile files('libs/commons-lang3-3.1.jar')
-    compile files('libs/commons-logging-1.1.1.jar')
+    compile 'commons-io:commons-io:+'
+    compile 'org.apache.commons:commons-lang3:+'
+    compile 'commons-logging:commons-logging:+'
     compile files('libs/dropbox-android-sdk-1.6.1.jar')
     compile files('libs/image-uniload.jar')
-    compile files('libs/json_simple-1.1.jar')
+    compile 'com.googlecode.json-simple:json-simple:1.1.1'
     compile files('libs/ouya-sdk.jar')
+    //compile 'com.dropbox.core:dropbox-core-sdk:3.0.6'
 }