Using .less instead of .css

to generate the .css file from the .less file run: $make styles
rewrite wrong variable name
fix .travis.yml
fix .travis.yml
fix .travis.yml
using npm instead of apt-get in .travis.yml
[enh] italian translation added
fix little style errors
Adding placeholder in search-field
Merge pull request #46 from pointhi/styles

Using .less instead of .css
[enh] engine default category init
[fix] #47
[fix] pep8
[enh] 0.3.0 pypi version
[doc] wiki link added
[fix] yahoo url extraction