0.4.16

Add activity.py to analysis human activity

• Entropy to calculate Entropy and Entropy rate
• Confidence ellipse to calculate and plot confidence ellipse
• Activity plot to plot Activity

Update function tbd.mobile_plot_activity rename it to tbd.plot_activity

• Add parameter fontsize to control fontsize of xticks and yticks
• Add parameter yticks_gap to control yticks
• Add parameter xticks_rotation and xticks_gap to control xticks
• Use column group to control the color of the bars