Initial API document for WCSAxes
Minor fixes
Added an open question about tick/label location
Added section about overlaying multiple coordinate systems
describe alternative api for ticks
Added initial examples for WCS
Fix image directives in RST
Convert examples file to Markdown
Renamed examples
Use PNG instead of GIF
Fix paths
Fixed figures in Markdown file
Renamed example markdown file
Consolidated WCS document
Updated examples for new API
Added note about examples
More small changes
Further improvements to API
Minor consistency fixes
Improved grid API