Oracle Sql Developer icon enhancement

[ghokun]

Old icon does not look good when scaled down and the green arrow is not recognizable.

I used "sqlitebrowser.svg" for a little enhancement

(I use sql developer daily, wanted to change it)

Also as of version 4 they have changed icon in their website: http://www.oracle.com/technetwork/developer-tools/sql-developer/sqldev-101614-2340766.jpg

Old one:

Some tries:

[Foggalong]

Feel free to submit the one with the black background as a pull request :)