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Fix failing rspec #27
As I understand it, rspec was trying to call #to_ary on some numeric values for formatting (not sure the details there). This was hitting method_missing and trying to convert the method name to a unit. Now calls super if the method name isn't defined as a unit.
The last commit fixes the problem so that the builds now actually run. The rest of the failures are because the code is apparently incompatible with those versions of ruby. I suggest removing them from the travis config and opening branches to fix each of the issues individually. Also adding something to the README about version compatibility.