support for direct draw canvas
added demo data
simple heat map example implemented
adjust overlay API
fix Gruntfile.js
optimize texture
reorganize files
reorganize files
Merge branch 'overlay' of https://github.com/ChiChou/tellurian into overlay

Conflicts:
	dist/tellurian.min.js
	examples/js/tellurian.min.js
	src/util.js
update screenshot
bug fix for dropdown element
added HeartBleed History data powered by ZoomEye
re-render heat map
443 data added
fix "blackout" bug

fix date format in Gruntfile.js
more data from ZoomEye added
update drop down
fix typo
Merge branch 'overlay' of https://github.com/ChiChou/tellurian into overlay

Conflicts:
	.gitignore
	dist/tellurian.js
Merge pull request #3 from ChiChou/overlay

Overlay