Updating new POS tags

Retrieved the following tags from the Irish Dependency Treebank that
were lost in the original Universal mapping:
- Proper Noun (PROPN)
- Subordinate Conjunction (SCONJ)
- Interjection (ITJ)

Mapped the following tags from 2013 Universal POS-tag name to 2014
Universal POS-tag name:
- Punctuation . —> PUNCT
- Particles PRT —> PART