Added Login Screen

Added a login screen that launches from menu. It is a second activity
that launches after main activity whenever the login menu is selected.
The login activity consists of a webview that displays run keeper login.
Updated layout of MapData (need to rename to something more relevent)

Updated the screen so there is only 1 butt on for stoping and starting a
workout. Since there is no longer a login webview I tried to fill the
empty space the best I could at this stage. It will eventually be filled
with workout options/data. On this page I also updated the toast
messages that are displayed.
Added workoutInfo Class

this holds information about workout including Notes, Type, Equipment
used, Etc.
Workouts post using actuall date and workout type, rather than a constant value.
Added application class to hold global variables

So far I'm using this to hold HealthGraphApi object mainly so that the
api accessToken can be used anywhere int he application once set.