Change AppCompat V7 to standard library and Implement store search UI

1. Disable Appcompat-v7 lib
	- Comment out "'compile 'com.android.support:appcompat-v7:21.0.2’" in build.gradle file
	- Replace prefix "app:" to "android:" in all resource files
	- Replace standard include files for Activity, Fragment and Option classes ; for example, include android.app.v4.Fragment -> android.app.Fragment.
	- Change application theme to standard one in values/styles.xml: android:Theme.Holo.Light.
2. Implement search in AppBar
	- Adding standard search and new icon(ic_action_search and ic_action_new) to drawable folder
	- Refer to http://developer.android.com/guide/topics/search/search-dialog.html
	- Define search menu in menu/menu_main.xml
	- Define asearchable configuration file: xml/searchable.xml
	- Define searchable activity: StoreActivity class, AndroidManifest.xml
	- Define SearchView widget in menu/menu_main.xml
3. The bug: pressing back key in store activity doesn’t come back to mainActivity
	- Fixed this problem by setting parentActivityName in StoreActivity in AndroidManifest.xml