version bump & last resort fix for luin/node-readability#8

[buley]

I experienced some errors with the same type of origin as discussed and resolved in #8

/Users/account/Code/testapp/node_modules/node-readability/src/helpers.js:203
    topCandidate.innerHTML = document.body.innerHTML;
                                          ^
TypeError: Cannot read property 'innerHTML' of null
    at Object.module.exports.grabArticle (/Users/account/Code/testapp/node_modules/node-readability/src/helpers.js:203:43)
    at /Users/account/Code/read/index.js:5:14
    at /Users/account/Code/read/node_modules/jsdom/lib/jsdom.js:252:9
    at process._tickCallback (node.js:415:13)

jsdom apparently doesn't a allow you to create a new BODY tag so there seems no resort but to return an Error when no body tag exists.

Added a test to check for this.

  $ /usr/local/share/npm/bin/mocha test/readability.test.js 

  node-readability
    ✓ should get document (2152ms)
    ✓ should get document with frames (3177ms)
    ✓ should handle the html that missing body tag 
    ✓ should let helpers.grabArticle handle html that's missing a body tag 

  4 passing (5s)