Template for variables in to_latex()
Me and several of my colleagues typically create output for variables that have greek letters. Inside pandas, we then call them "epsilon", "sBar" or similar. Right now we have to run a string replace on the output of to_latex() and then manually save it to a file. 

It'd be nice to be able to give to_latex() a template such as ['epsilon':'$\epsilon$', 'sBar':'$\bar s$'] and then to_latex() would replace these in the output accordingly. 
