Merge pull request #2 from Linell/master

Fix incorrect naming that broke installation
Update version so fix will get reflected on MoonRocks site
Update and rename mjolnir.bg.grid-0.2-1.rockspec to mjolnir.bg.grid-0.1-2.rockspec
Update adjustheight function
Merge pull request #3 from nhoag/master

by @nhoag: Update adjustheight function
Update the rockspec so that the Luarocks install works.