Update dependencies.
Make tests HTML valid.
Use underscore's object functions in more places.
Merge pull request #127 from XhmikosR/deps

Update dependencies.
Merge pull request #130 from XhmikosR/master

README.md: use the master branch for the Travis badge.
Merge pull request #128 from XhmikosR/use-isX

Use underscore's object functions in more places.
Merge pull request #129 from XhmikosR/tests-html

Make tests HTML valid.