Changing Go default to 1.2, aliasing 1 => 1.2
Retaining go version 1.0 alias to 1.0.3
Defaulting Go version to latest non-tip (1.2.1)

since I'm in there anyway...
And now bumping to go1.2.2 since it's out :smiley_cat:
Merge pull request #236 from meatballhat/upgrading-to-go1.2-as-default

Changing Go default to 1.2, aliasing 1 => 1.2