Update grails sample to follow Twitter behaviour change

Twitter web recently changed its <title> displaying method using ajax.
Initially, the title is just "twitter" only, after it changes.
I updated to use Twitter mobile web.(grails sample and test)
update gradle version
updated gradle

this allows some simplification of the build.gradle file as the signing
plugin is now included in gradle core
correct blog URL
Update readme.md
updated blog URL
Merge branch 'master' of github.com:robfletcher/betamax
upgrade gradle
upgrade snakeyaml
upgrade gradle
set version number 1.1
moved base package from betamax to co.freeside.betamax
use local target dir in example project
use newer version of spock & correct project URL in pom
update example URLs used in tests
Merge pull request #45 from nobusue/fix

Fix TimeZone issue in testcase
Merge pull request #49 from nobusue/fix-grails-sample

Update Grails example caused by Twitter change
Update readme.md
removed subproject
added travis config