fragment and activity code cleanup, new SearchFragment
partial implementation of SearchFragment
Merge branch 'searchFeature' of https://github.com/USM-RCG/openhds-tablet into searchFeature

Conflicts:
	application/res/layout/generic_dropdown_item.xml
	application/res/layout/search_fragment.xml
	application/src/main/java/org/openhds/mobile/activity/NavigateActivity.java
	application/src/main/java/org/openhds/mobile/activity/PortalActivity.java
	application/src/main/java/org/openhds/mobile/fragment/SearchFragment.java