In capistrano config, increment Ruby version for rvm.
Capistrano RVM bundle wrapper task.
Revert "Capistrano RVM bundle wrapper task."

This reverts commit 82527fa7fd2e80b6edcf328378e9b3612d40bd89.
Merge branch 'staging'
Merge branch 'staging'
Merge branch 'staging'
autosave for sentences disabled

should avoid ActiveRecord::StatementInvalid: PG::NotNullViolation
related to #340
Test in 2.1.0 but not in ruby-head anymore on travis.
Merge branch 'master' into staging