Igel

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* added interactive mode in cli
* added colors in cli to improve readability
* updated setup

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* fixed igel initialization step
* updated examples
* added gids to readme

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* added support for json as a configuration file
* added support for providing read data options
* added CV class support
* added cross validation support

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* added clustering support
* all clustering classes of sklearn are now supported

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* added init command
* users can get started quickly by getting a default yaml file "on the fly"

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* added support for other ensemble models like adaboost, extra trees etc..