Pythonic implementation of tsvtojson


https://github.com/siddharthasandhu/etllib/commit/9e628e7945a6e688f68486d078328f4b8c642f91


We can now use tsvtojson in the following format:
```
from etl.tsvtojson import tsvtojson

tsvtojson(tsvfilename,jsonfilename,objecttype,colHeaderFile,uniqueCol,encoding)
```