0.1.12

• reusing named styles as much as possible (#8 )

0.1.11

• image support

0.1.10

• ability to set font name

0.1.9

• rich text inside cells
• empty cell() call now applies the row styles properly

0.1.8

• ability to define and use stylesheets
• sheet names and names (references) are now normalized to strings which Excel accepts (unacceptable chars are replaced with underscore)