release 0.2.0

What's new?

This release provide new chart api and tooltip plugin. Also we changed build folder.
Current build folder has following structure:

- css
- plugins
...

We recommend use files only from build folder. Now all files begin with prefix "tauCharts".

How to migrate from 0.1.* ?

If you used tauCharts as global variable, you should rename tauChart to tauCharts.
Also you should change paths for files from build directory.