Update schedule to 5th presentation
Typo
Updated introduction
Deleted irrelevant note
Added Stanford POS tagger paper to bibliography
Update schedule for last presentation
Minor fix on nlp.tex
Moved results to conclusion

Finished most of the explanations about Information Retrieval.
Removed epigraph and data mining chapter

Most of the chapter about Data Mining wasn't supporting the rest of the
work, thus it was for the best to remove it. However, some parts of it
were moved to the conclusion due to a lack of a place to put them --
the discussiion about cross validation and the bias-variance tradeoff.

The epigraph wasn't going to be used anyway.
Remove LaTeX generated files
Updated tcc.tex to use abntex2

This document is going to adhere to ABNT's format after this commit. The
`abntex2` class is good enough for my purposes, but I still have to
finish some things, e.g. add the remaining pre-textual elements in the
correct format and fix the appendices.

The changes made in this commit are:
  - Use `abntex2` class.
  - Switch from acm model for bibliographies to the ABNT one.
  - Add the commands to activate prextual, textual and postextual
    environments.
  - Removed some packages that are obsolete after the addition of
    `abntex2`.
  - Add a symbols page. I still need to put everything in it.