Fix three deprecated packages

[tripu]

npm has been throwing these errors for a long time:

npm WARN deprecated CSSselect@0.4.1: the module is now available as 'css-select'
npm WARN deprecated lodash@2.4.2: lodash@<3.0.0 is no longer maintained. Upgrade to lodash@^3.0.0.
npm WARN deprecated CSSwhat@0.4.7: the module is now available as 'css-what'

CSSselect and CSSwhat have not changed in ca. two years; lodash was stuck at a major version that is marked as deprecated. All these three are dependencies of whacko.

I submitted a couple of PRs for whacko to get this updated; those were promptly merged, and a new version of whacko published to npm (the previous one was eight months old). This PR incorporates that change in Specberus.

There was an issue with the new package css-select. My solution is to replace $.find('> foo') with $.children('foo'), more or less as suggested here (see also cheeriojs/cheerio#780, cheeriojs/cheerio#728 and cheeriojs/cheerio#635).