Add script that counts word frequencies in the debate data

Script for usage in workshop on December 1, 2014 for the Digital
Hermeneutics course.
Add new LIWC dictionaries to .gitignore
Change name of default es index to 'embem'

'embem' is the alias we use for the current embodied emotions index. The
alias makes switching between indices easier.
Add script to print words for LIWC categories

Given a LIWC dictionary and a category, the script prints the words in
the category.