wget https://play.google.com/store/apps/details?id=com.twitter.android
wget https://play.google.com/store/apps/developer?id=Google%20Inc.&hl=tl
wget https://play.google.com/store/apps/category/CARDS/collection/topselling_paid
wget https://play.google.com/store/apps/collection/topselling_new_free
test: red -> green

modify AndroidMarketApplication

modify AndroidMarket
use specify version sanitize

[because] https://travis-ci.org/drecom/android_market_api/jobs/9219742#L38
Installing nokogiri (1.6.0)
Gem::InstallError: nokogiri requires Ruby version >= 1.9.2.
Merge pull request #21 from drecom/issues/20

for Google Play design renewal #20