Margins change

#### Purpose

Modify margins according to document.

#### Modifications

Some margins are changed. Changed height of subnamespace. New margins:
![image](https://cloud.githubusercontent.com/assets/8158551/5267586/df9bebe2-7a5a-11e4-8a10-d5d4d89d70aa.png)

#### Unit tests
![image](https://cloud.githubusercontent.com/assets/8158551/5267645/3aeedd6a-7a5b-11e4-8922-79689efc4872.png)

#### Additional references

[MAGN-5559](http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-5559).

#### Reviewers

@elayabharath, please, take this and check margins. Some of them I am left a bit different of your proposal because it need more code, I am not sure it is possible for current architecture. Are all margins work for you (classes margins will be a different PR, I think)?

@ramramps, please, take a look.
@Benglin, FYI.