add new method: exportImage
Update README.md

correct colorsheme example
added component.json
Merge branch 'master' of github.com:sunng87/heatcanvas
update README: add section for installing from bow
added version for bower
Respond to OpenLayer map resizes
Add ability to resize canvas
fix null reference to map
Merge pull request #12 from qbit/master

Few commits to make the heatcanvas respond to OpenLayers resize events.
added rendering callback to leaflet plugin
Merge branch 'master' into gh-pages
enhanced leaflet example