Merge pull request #892 from leobalter/generator-spread

src/generators/default/class-method-definition.template

src/generators/default/expression.template

src/generators/default/method-definition.template

src/generators/default/statement.template

src/generators/non-strict/expression.template

src/generators/non-strict/method-definition.template

src/generators/non-strict/statement.template

src/generators/yield-identifier-non-strict.case

src/generators/yield-identifier-spread-non-strict.case

src/generators/yield-identifier-spread-strict.case

src/generators/yield-identifier-strict.case

src/generators/yield-spread-arr-multiple.case

src/generators/yield-spread-arr-single.case

src/generators/yield-spread-obj.case

...ssions/class/gen-method-yield-identifier-spread-strict.js

...e/expressions/class/gen-method-yield-identifier-strict.js

...expressions/class/gen-method-yield-spread-arr-multiple.js

...e/expressions/class/gen-method-yield-spread-arr-single.js

...language/expressions/class/gen-method-yield-spread-obj.js

...age/expressions/generators/yield-identifier-non-strict.js