mpltex v0.7: Compatible with Matplotlib v2 & v3

• Fix some formats due to the change of defaults in Matplotlib v2 & v3.
• Test compatibility with Python 3.

mpltex version 0.5.1

• Replace brewer2mpl with palettable
• Add color schemes tableau_10 and tableau_20
• Change default color scheme to tableau_10
• Remove nextlinestyle
• Add linestyles as a short name for linestyle_generator
• Add a tutorial jupyter notebook

mpltex version 0.4

• Add more brewer colors.
• Make the treatment of colors being consistent with line styles.

mpltex version 0.3

• Add rsc_decorator.
• Use Helvetica font for all plots.

mpltex version 0.2.3

• This version enable linestyle_generator to accept empty list and None keyword.
• All users should upgrade to this version.

mpltex version 0.2

• Replace nextlinestyle with linestyle_generator for generating a sequence of line styles.

mpltex version 0.1

Version 0.1

• Support Publishers (ACS), Presentation, and Web formats.
• Support cycling color, line style, and line marker with hollow type for plotting line arts.