SENTIMENT: Handle different text pathways

[gjwgit]

All of the following should be supported:

• [x] ml sentiment hugging The best is yet to come This returns the sentiment of the text on the command line.
• [x] ml sentiment hugging news.txt This reads the text for the file if it exists
• [x] cat news.txt | ml sentiment hugging This reads the text input from STDIN
• [x] ml sentiment hugging This will prompt user for input text

See the aztext package for some example code.

For the name file version, check if there is a single argument, and if so, does the named file exist, and if not, does it look like a filename, and if so generate a file not found error, but if it doesn't look like a file name generate the sentiment of the word.

[shashank-gv]

sentiment should be able to handle these pathways now