updated .gitignore
Replaced xml file with SQLite database, added menu for adding and
removing accounts, added file 'version.properties', updated Twitter4J
library to version 4.0.2, updated README, renamed a few class names from
'*User*' to '*Account*', changed JavaDoc tag value of @author from
'multiprogger' to 'sourcefranke'
Merge remote-tracking branch 'origin/develop'