adapted a pattern to parse DBLP entries.

DBLP seems to send <pre class="verbatim select-on-click"> now
instead of only <pre>.
ArrayIndexOutOfBoundsException was produced when the user  tried to apply changes in "Setup selectors" right after closing all databases. Now the exception is caught and a message is shown, telling the user that the changes could not be applied.
Fixed bug #1240. Now, strings with length of one character can be included and no exception is thrown by the system.
Fix undoing Cleanup/Convert to Biblatex

When Cleanup/Convert to Biblatex converted year/month fields to a date
field, it used to store erroneous undo information. This change fixes
it.
Merge branch 'master' of https://github.com/leeohaddad/jabref into leeohaddad-master

Conflicts:
	CHANGELOG
	src/main/resources/help/About.html
Merge branch 'leeohaddad-master'
Update Authors.html

 * authors alphabetically
 * tabs2spaces
Merge branch 'master' of https://github.com/lucianamelo/jabref into lucianamelo-master

Conflicts:
	CHANGELOG
	src/main/resources/help/About.html
Merge branch 'lucianamelo-master'
Merge pull request #25 from SatiricalThumb/master

Adapt pattern to parse DBLP entries.
Add CHANGELOG entry and About.html entry
CHANGELOG: tab2spaces
Merge pull request #30 from dahlheim/fix-convert-to-biblatex

Fix undoing Cleanup/Convert to Biblatex
Merge branch 'master' of github.com:JabRef/jabref
Add CHANGELOG entry