[Truffle] Check the version of Graal before we try to use it.
Merge branch master into truffle-head.
Marshal Time zone and accept ENV["TZ"] values such as "JST-9"

Also fixes incorrect types for offset.

Fixes #1837.
Fix "argLine" parameter in core/pom.xml

Maven does not accept more than one tag
Merge pull request #1885 from gustavotemple/fix-argline-pom

Fix "argLine" parameter in core/pom.xml
Merge branch 'jruby-1_7' of github.com:jruby/jruby
Merge branch 'master' into truffle-head
[Truffle] Add tool for removing bundled Truffle from a complete JAR.