Remove unused resources

java/res/drawable-hdpi/key_hint_underscore_large_holo.9.png

java/res/drawable-hdpi/keyboard_hint_at.9.png

java/res/drawable-hdpi/keyboard_hint_colon.9.png

java/res/drawable-hdpi/keyboard_hint_doublecross.9.png

java/res/drawable-hdpi/keyboard_hint_exclamation.9.png

java/res/drawable-hdpi/keyboard_hint_greater.9.png

java/res/drawable-hdpi/keyboard_hint_plus.9.png

java/res/drawable-hdpi/keyboard_hint_question.9.png

java/res/drawable-hdpi/keyboard_hint_quote.9.png

java/res/drawable-hdpi/keyboard_hint_smaller.9.png

java/res/drawable-hdpi/keyboard_hint_star.9.png

java/res/drawable-hdpi/mic_slash_holo.png

java/res/drawable-hdpi/ok_cancel.png

java/res/drawable-hdpi/ok_cancel_holo.9.png

java/res/drawable-hdpi/speak_now_level0.png

java/res/drawable-hdpi/speak_now_level0_holo.png

java/res/drawable-hdpi/speak_now_level1.png

java/res/drawable-hdpi/speak_now_level1_holo.png

java/res/drawable-hdpi/speak_now_level2.png

java/res/drawable-hdpi/speak_now_level2_holo.png