Add an Application Icon

[ianhanniballake]

Utilizing the general icon design guidelines for Android applications and the launcher application design guidelines, create a new launcher icon in the three sizes:

• High density screen (hdpi): 72 x 72 px
• Medium density screen (mdpi): 48 x 48 px
• Low density screen (ldpi): 36 x 36 px

(Note that there is a further requirement for a 512x512 px for Marketplace requirements - creating a launcher icon that scales to this size is highly preferred, although there is a separate issue: GH-5 for this requirement).

[kamiawolf]

Done