Revert "Merge pull request #456 from acramatte/NavbarCollapseFixedHeight"

This reverts commit 265d3bf2659621e8ccba59dc7664c3b7a6623c24, reversing
changes made to 5088e747b3b228fac86a6b91d304303e00f3bdd1.
Merge pull request #2 from gwtbootstrap/master

Revert "Merge pull request #456 from acramatte/NavbarCollapseFixedHeight...