Bug 1033686 - Make sure pre-search and post-search replace each other. r=nalexander

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rename : mobile/android/search/java/org/mozilla/search/DetailActivity.java => mobile/android/search/java/org/mozilla/search/PostSearchFragment.java
rename : mobile/android/search/java/org/mozilla/search/stream/CardStreamFragment.java => mobile/android/search/java/org/mozilla/search/PreSearchFragment.java
rename : mobile/android/search/java/org/mozilla/search/autocomplete/AutoCompleteFragment.java => mobile/android/search/java/org/mozilla/search/autocomplete/SearchFragment.java