Log Message:
Update ruby-tins to 1.12.0.

2016-08-04 Release 1.12.0
* Add Tins::Unit.parse? method to check for units in strings.

2016-07-12 Release 1.11.0
* Provide Tins::Unit.format and Tins::Unit.parse methods.

2016-05-25 Release 1.10.2
* Avoid some warnings.

2016-04-15 Release 1.10.1
* Fix bug in go if a concatenated argument comes last.

2016-04-12 Release 1.10.0
* Support mixed rest arguments in go argument parsing.