v0.1.0, 08/25/2014
    - Initial Release

v0.1.3, 09/21/2014
    - Added logic gate elements
    - Added transparent and dpi options to save() function
    - Fixed issues with zooming and rotating elements with arcs
    - LaTeX typesetting uses sans-serif, regular fonts for consistency
    
v0.1.4, 09/30/2014
    - Added elements: LED, OPAMP_NOSIGN, GAP_LABEL, ELLIPSIS
    - Add function to group several elements into one
    - Add blackbox() function to generate box elements with arbitrary inputs
    - Allow element definition to specify label alignment
    - Added linestyle to element kwargs and definition
