remove html tags from stats_empty* strings and split them in _title/_desc
newInstance now accepts 2 more paremeters: emptyLabelTitleResId and emptyLabelDescResId
update all stats fragment to use new stats_empty strings
Merge pull request #1378 from wordpress-mobile/issue/307-remove-html-tags-from-strings

fix #307 remove html tags from stats_empty strings
Merge branch 'develop' into issue/1258-drop-gingerbread-support

Conflicts:
	src/org/wordpress/android/ui/stats/StatsClicksFragment.java
	src/org/wordpress/android/ui/stats/StatsCommentsFragment.java
	src/org/wordpress/android/ui/stats/StatsCursorFragment.java
	src/org/wordpress/android/ui/stats/StatsCursorTreeFragment.java
	src/org/wordpress/android/ui/stats/StatsReferrersFragment.java
	src/org/wordpress/android/ui/stats/StatsSearchEngineTermsFragment.java
	src/org/wordpress/android/ui/stats/StatsTopPostsAndPagesFragment.java