Version 0.4.4 (August 2018)

• Major modifications to adsorbates fingerprinter
• Bag of site neighbor coordinations numbers implemented.
• Bag of connections implemented for adsorbate systems.
• General bag of connections implemented.
• Data cleaning function now return a dictionary with 'index' of clean features.
• New clean function to discard features with excessive skewness.
• New adsorbate-chalcogenide fingerprint generator.
• Enhancements to automatic identification of adsorbate, site.
• Generalized coordination number for site.
• Formal charges utility.
• New sum electronegativity over bonds fingerprinter.