Fix ReferenceError in default theme

[chadxz]

There does not seem to be any test suite for the theme. This fixes an uncaught exception when you are using the html output with the default theme and your code has nested attributes.

i.e.

$ documentation build -f html -o docs
lodash.templateSources[1]:136
__e( name) +
     ^

ReferenceError: name is not defined
    at eval (lodash.templateSources[1]:136:6)
    at Array.forEach (native)
    at eval (lodash.templateSources[1]:134:22)
    at Array.forEach (native)
    at eval (lodash.templateSources[1]:113:21)
    at eval (lodash.templateSources[3]:84:11)
    at Array.forEach (native)
    at eval (lodash.templateSources[3]:80:7)
    at /Users/cmcelligott/.nvm/versions/node/v6.9.1/lib/node_modules/documentation/default_theme/index.js:86:30
    at ConcatStream.<anonymous> (/Users/cmcelligott/.nvm/versions/node/v6.9.1/lib/node_modules/documentation/node_modules/concat-stream/index.js:36:43)

Closes #559.

[tmcw]

The theme is tested by the nested.input.js fixture - https://github.com/documentationjs/documentation/blob/master/test/fixture/html/nested.input.js and the html test - could you add a nested attribute to that fixture to replicate this error and use UPDATE=true npm test to update the fixture? Thanks!

[chadxz]

looking into this now

[chadxz]

OK I added an example to nested.input.js. The default template only supports one level of nesting, and this patch fixes that so it doesn't throw the ReferenceError. The example in #559 shows two levels of nesting- the default template doesn't support rendering that, but will not throw a ReferenceError either. So I think it'd be fine to still close that ticket.

[tmcw]

👍 Thanks! In the spirit of our contributing policy, I've invited you as a collaborator so you can push & merge branches without my approval, if you'd like to!