Wrong generation of class name

[sleeper]

As explained in yeoman/yeoman#716, although the underscore.string, classify method is thought to transform a string into a class name it is not safe enough as it does not handle non-alphanum characters.

For example, "this is.my.wonderfull.class" will produce ThisIs.My.Wonderfull.Class, which is not a class name (the .), although we would prefer to get ThisIsMyWonderfullClass.

[sindresorhus]

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