add set city function to weather forecast demo:90%
Merge branch 'master' of https://github.com/lovelease/helloandroid.git

Conflicts:
	gen/com/example/helloandroid/R.java
	res/values/strings.xml
	src/com/example/helloandroid/weatherforecast/activity/SetCityActivity.java
	src/com/example/helloandroid/weatherforecast/activity/WFMainActivity.java
	src/com/example/helloandroid/weatherforecast/consts/PublicConsts.java
	src/com/example/helloandroid/weatherforecast/dao/DBHelper.java
	src/com/example/helloandroid/weatherforecast/widget/UpdateWidgetService.java