`nin new` should add template .gitignore file

[stianjensen]

After running nin new I get the following with git status:

$ git status
On branch master
Your branch is up-to-date with 'origin/master'.
Untracked files:
	gen/
	index.html
	nin.json
	res/
	src/

At least gen should be in the gitignore file. Also bin is a folder we want to gitignore

[aleksanb]

But it does, @stianjensen! You must have removed it when removing the .git subdirectory in the /re repository!

[aleksanb]

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