Revert "removed unnecessary line - fix in previous commit"

This reverts commit dfc0d0debeffa3607523e8f5cf9d21fac6d545ab.
Revert "fixes #7 - messed up header view after notifyDataSetChanged() from list adapter"

This reverts commit 1795053942c92910d64083363ca60449b69424c7.
Added missing gradle file
added custom view RootLayout which takes care of restoring header view and listview background after relayout
Merge branch 'master' into dev

Conflicts:
	.gitignore
	sample/build.gradle