Merge branch 'release/0.4.1'
fix wrong filename in jubaconv example
new location to jubatus-installer
migration to new Twitter API

See: https://dev.twitter.com/blog/planning-for-api-v1-retirement
update build process to use tarball
fix expression (clustering is confusing)
add link to client compatibility; fix expression
Remove redundant spaces
Remove redundant spaces
Merge branch 'master' into develop
fixed typo in commands of jubactl
Merge branch 'master' into develop