Py-stringsimjoin

Compared to Version 0.1.0, the following is new:
- All the join methods written in Python have been Cythonized to run much faster.

**Contributors:**
[Paul Suganthan G.C.](https://github.com/paulgc), and [Adel Ardalan](https://github.com/adelaneh)

- Initial release.
- Supports joins using 6 similarity measures - cosine, Dice, edit distance, Jaccard, overlap and overlap coefficient.
- Contains 5 filters - Overlap filter, Size filter, Prefix filter, Position filter and Suffix filter.

**Contributors:**
[Paul Suganthan G.C.](https://github.com/paulgc), [AnHai Doan](https://github.com/anhaidgroup), with additional contributions from [Pradap Konda](https://github.com/kvpradap), and [Sanjib Das Kumar](https://github.com/sanjibkd).