words.txt updated

words.txt:
- removed words that were left because of mistake in regular expression
(word like "отЖигу?льный")
Script writes very alpha-versions of poems

poemwriter.py:
- list of vowels was updated with uppercase letters;
- regular expression was updated due to <see above>;
- added line_pattern function;
- added basic (simpliest) generation of poems.

README updated, short_words.txt deleted (no need).