add onClick to buttons in activity_main.xml
edit AndroidManifest.xml
add res/menu/menu_main.xml and res/layout/activity_how_to_get.xml
add AboutActivity.java, HowToGetActivity.java, OptionsActivity.java, SightseeingActivity.java
Merge remote-tracking branch 'upstream/android' into android

Conflicts:
	src/com/blstream/myguide/MainActivity.java
fix bad formatting in AndroidManifest.xml
fix switch statement in MainActivity.java
Merge pull request #13 from ampatalas/android

Set up navigation between application screens