Merge pull request #8 from charlesarmitage/nexus7-drawables

Tweak image sizes for Nexus7
TTA2 changed 'west' exit colour to dark green to be more visible
TTA2 Oubliette vanishes after the fire shield is used now
TTA2 Added some negative uses for fisherman, rod and chainsaw with people
TTA2 corrected use of its and it's
TTA2 corrected more use of its
TTA2 changed 'I'm wiggling my pinky at you' for readability
TTA2 added shaved yak image to larry's once he's shaving
TTA2 added more negative uses
TTA2 correct image size for bitey fish
TTA2 added bug report for artifacts in button images
Updated README.md to include 'new game welcome dialog' and raised priority of 'what's new' dialog
Added basic new game welcome dialog
Adding styling for new game welcome dialog - not working yet
Moved styles to common res directory
Improved new game welcome dialog styling, more work to do
Converted new welcome dialog to use a relative layout
A few changes to android studio configuration files
whats new and welcome dialogs are fixed for back and ok
Whats new dialog will only show once for new versions