Modified category-legend for bar blot for paper.

Also fixed an issue with SVG text attributes for Illustrator import.
See https://github.com/zakandrewking/visbio/wiki/performance-notes.
Modified category-legend for bar blot for paper.

Also fixed an issue with SVG text attributes for Illustrator import.
See https://github.com/zakandrewking/visbio/wiki/performance-notes.
Merge branch 'fix/legend-mods' of github.com:zakandrewking/visbio into fix/legend-mods
Added tick format for y axis to options.
Merge pull request #18 from zakandrewking/fix/legend-mods

Fix/legend mods
Moved map cache to filesystem-specific caches

Fixes #19
Much improved readme.
Update README.md
Update README.md
Cells in IPython notebook are now 800px tall
Merge branch 'master' into dev

Conflicts:
	.gitignore