removing age attribute for #stars

updating version number in README

Merge pull request fmilthaler#25 from fmilthaler/develop

This merge adds `yfinance` alongside `quandl` in order to download historical stock prices.

The documentation, Readme, examples, and tests have been updated to account for the new option `yfinance`.

Obtaining historical stock prices from `quandl` remains the default option.

Testing:
All examples in `./example/` are now automatically tested for failure.

Documentation:
- A bash script is included to automatically copy example python files in `./example/` to `./docs/`, slightly modify to reduce the number of lines, and are now included in the documentation. A download link is also provided for each example.
- docstrings have been improved in some places for a cleaner/better automated documentation

This merge marks version 0.2

This closes fmilthaler#22

updating setup.py: setting intended audience, adding link to document…

…ation, updating release download to 0.1.1

Rendered TeX expressions in 2b028d5