ES6 support

[twada]

going to support ES6

TODO

• switch parser
• TemplateLiteral
• TaggedTemplateExpression
• ArrowFunctionExpression
• ClassExpression
• Destructuring
• Binary and Octal Literals
• SpreadElement
• Enhanced Object Literals
• capture whole ArrayExpression
• capture whole ObjectExpression
• refactor
• optimization

[coveralls]

Coverage increased (+0.09%) to 95.02% when pulling 32502c3 on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.09%) to 95.02% when pulling 32502c3 on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.09%) to 95.02% when pulling 502f61e on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.09%) to 95.02% when pulling 502f61e on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.09%) to 95.02% when pulling 502f61e on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.7%) to 95.63% when pulling 3ad5ba8 on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.7%) to 95.63% when pulling 3ad5ba8 on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.7%) to 95.63% when pulling b31912c on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.7%) to 95.63% when pulling b31912c on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.27%) to 95.2% when pulling fad843b on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.27%) to 95.2% when pulling 2d2e2b0 on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.27%) to 95.2% when pulling 2d2e2b0 on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.33%) to 95.26% when pulling c02a294 on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.33%) to 95.26% when pulling 709961e on es6 into 1e1da30 on master.

[coveralls]

Coverage increased (+0.33%) to 95.26% when pulling 48053b0 on es6 into 1e1da30 on master.