Removed blocker to build tools

`bower install bootstrap` is a very convenient way to install bootstrap into a project. It includes the dist folder for js and css files and also includes the build tools. However by ignoring " .* " you are not allowing developers to download the configure files such as less/.csslintrc and grunt/.jshintc from bower. 

These are crucial elements to building with `grunt`. Its likely best to either only serve the dist folder with a `bower install bootstrap` or include all the tools necessary to build bootstrap similar to a git clone. I suggest the latter. 

Note: if there are crucial hidden files to ignore, implicit ignores may prove to be a better route.