TISTUD-6595 Theme: Dark Theme from Studio dashboard makes text from tab ...

Modified theme after the changes. The unselected tab title has a better color now.
The bg color of explorer and other views is not very black now. They have a dark grey color, getting closer to Eclipse dark theme.

However, I tried setting the dark theme background to tiapp editors as well - however, it didn't go well. we are currently using icons/images that doesn't have a transparent bg (especially, the status images related to service install success/failure). The labels looks ugly as well. So, there is a lot of work to do in that area to fix the dark color for form editors.

![screen shot 2014-11-07 at 4 40 30 pm](https://cloud.githubusercontent.com/assets/2413570/4962451/539d3a20-66e0-11e4-96de-c96f10433124.png)