Bug 427138 - Integrate dark theme into Eclipse SDK product

Change-Id: I220cdeff70183966d6fbd495e737b110d384eec2
Signed-off-by: Lars Vogel <Lars.Vogel@gmail.com>
Changed test.performance project settings needed to allow compiling with
JDK7.

Signed-off-by: Timo Kinnunen <timo.kinnunen@gmail.com>
Added README.md and CONTRIBUTING.md files.

Signed-off-by: Timo Kinnunen <timo.kinnunen@gmail.com>