add login and register activity
Merge branch 'master' of https://github.com/itravel/android-user

Conflicts:
	demo/AndroidManifest.xml
new: 登录页面、注册页面（未完成）
Merge branch 'master' of https://github.com/itravel/android-user.git

Conflicts:
	demo/res/layout/fragment_explore_list_destination.xml
	demo/res/layout/fragment_explore_map_destination.xml
	demo/src/demo/travel/views/explore/DestActivity.java
	demo/src/demo/travel/views/explore/DestListFragment.java
	demo/src/demo/travel/views/explore/DestMapFragment.java