• Added ability to change font
• Added ability to change cell border type
• Added style_ob argument to all "styling methods" to accept Styler object so styles can be reused.
  The ability to directly pass style specifiers is deprecated and may break in a future version.
• Added basic ability to read stylized excel into a stylized StyleFrame
  Currently doesn't support reading style from a subset of sheet (ie using startrow, startcol and the such.)
  Pass read_style=True to StyleFrame.read_excel
• Added ability to provide a default Styler object to StyleFrame init, and added deprecation message when not
  passing Styler object to "styling methods".