PostgreSQL rdoc
Add PostgreSQL.local_network_access since :peer doesn't work there
Improve Shell command forms rdoc
Add TestShell tests for early/late error exit
Interpret sh_args error: true as per rdoc
Add shell pipefail support (default off)
Default to bash pipefail when :error is true (the default)
Correct Hashdot version check for pipefail
Merge branch 'postgres-ii' into dev
Merge branch 'pipefail' into dev
Use ruby-head instead of 2.1.0 currently broken in Travis CI/RVM

See also: travis-ci/travis-ci#2220
History for pipefail merge