Merge branch 'release/0.3' into develop
Bump v. 0.4-SNAPSHOT.
Add the possibility of checking 6-digit to 9-digit passwords.
Merge branch 'hotfix/0.3.1' into develop

Conflicts:
	pom.xml
Add URL of hosted PDF documentation.
Merge.
Remove test method.
Add arguments checking logic.
Bump v. 0.4.
Bump v. 0.4.
Update texinfo documentation.
Add automatically generated files to ignore list.
Merge branch 'release/0.4'