New floating action buttons, more work on tutorial

MainActivity:
-removed old action buttons, now using pre-built library com.melnykov:floatingactionbutton:1.0.3
-only using one action button now, colors and drawable change based on state

TutorialEventListFragment:
-now fleshed out, still requires some cleanup

TutorialActivity:
-layout tweaked so that the buttons, page indicator and page view align properly

TutorialWelcomeFragment:
-added filler text to test scrolling