Added Thompson Sampling Strategy for Gaussian with Unknown Mean + Variance#12

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Commits on Mar 14, 2017

Moved `strategy` into subfolder and added `estimated_arm_sds`
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Added ThompsonSampling for Gaussian with unknown mean + variance
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Commits on Mar 15, 2017

Changed `pull_arm` to private `_pull_arm` and `num_arms` to property
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