Rename Flatland.tmtheme to Flatland.tmTheme

small case fix so that it shows up correctly in Sublime
Merge branch 'patch-1' of https://github.com/charlietran/flatland into charlietran-patch-1

* 'patch-1' of https://github.com/charlietran/flatland:
  Rename Flatland.tmtheme to Flatland.tmTheme