ENH: Do not mark TubeTK_USE_KWSTYLE as advanced.

Improve visibility.

Change-Id: Ibf73f89bdb0606b97079a2878f1fa9c37644c450
STYLE: Fix KWStyle errors.

Change-Id: I5fdd2b1759a23c773fa6ac13b674fa19d47232e4
Merge pull request #84 from thewtex/KWStyleAdvanced

Kw style advanced
FIX: Virtual environment setup
Merge pull request #88 from rkwitt/Fix-VirtualEnvSetup

FIX: Virtual environment setup