Remove "Top Result" category

#### Purpose

Remove "Top Result" empty category from list of root categories. We do not need it in new design.
![topresult](https://cloud.githubusercontent.com/assets/8158551/4409513/0d4dbb36-44de-11e4-9530-5eb6c89c1686.png)

#### Modifications

Removed all instances of `topResult` variable.

#### Additional references

[MAGN-4766](http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-4766).

#### Reviewers

@Benglin, please take a look.