1. Scrips can be input via a file.
2. Helper fucntion module added.
3. Modified test in ref directory for valid and invalid NSE scrip names.
Merge branch 'master' of github.com:rishabhsagar/stocks into read-from-scrip-file
modified test to add NS to the end of test scrips
added sleep to control the data pulling speed
functionality to read from scrip file.
---------------------------------------
Scrips are expected one / line
Merge branch 'read-from-scrip-file'