adding language: Esperanto

[niru86]

I'm trying to adapt prosodic to Esperanto: its stress is always paroxytonic abelo (en. bee) [a.'be.lo] but in poetry there can be elision and the word would become oxytonic abel'

Esperanto is as phonematic as Finnish, so I decided to use the orth feature, but I'm puzzled in LANG_stress.py because I don't understand its code :( Could you help me? I want to use prosodic for my MA research.