added logs activity and dependencies(*.xml, fragments, AndroidManifest);
updated build_number.sh changed dash to xml_dash entity;
added android:fastScrollEnabled="true" to ListView;
updated search bar setting of hint in code;
implemented deleteVocabularyFromDisk() in AboutFragment.java OnLongClick();
added REQUEST_ABOUT in onActivityResult() of VocabularyListFragment.java;
added checker for lastUpdatedDate in getLastUpdated() under VocabularyManager.java;
renamed LogManager.java to LogsManager.java;