Suggested changes to .gitignore

I would like to humbly suggest a few changes to .gitignore for when this project is updated next.
1 - as Android Studio is putting more and more stuff in .idea that is local, suggest
```.idea/*```
If you would rather play whack-a-mole instead of using a large hammer, the ones that the newest version of AS (Dolphin) also writes are
```.idea/compiler.xml
.idea/jarRepositories.xml
.idea/misc.xml
```

2 - For teams that are using macs for some of their development
```.DS_Store```