Enhanced object literals support

[kwolfy]

Unfortunately I could not cover the case with async enhanced object literals, cause in travis CI you have nodejs=4 tests

var obj = { async foo() {} };

Fix #33

[yahoocla]

Thank you for submitting this pull request, however I do not see a valid CLA on file for you. Before we can merge this request please visit https://yahoocla.herokuapp.com/ and agree to the terms. Thanks! 😄

[alexander-akait]

/cc @kwolfy looks it is require accept CLA, can you accept?

[alexander-akait]

/cc @okuryu can you review PR?

[kwolfy]

I accepted

[alexander-akait]

/cc @redonkulus

[alexander-akait]

/cc @okuryu

[okuryu]

OK, let's review.. It seems not to have tests for async syntax. Would you mind adding it?

[alexander-akait]

@okuryu yep, but we run test on node@4 and it is impossible to test

[kwolfy]

right

[okuryu]

oops! I see 😅

[alexander-akait]

/cc @okuryu can we merge this and release new version? We have some problems in webpack

[okuryu]

Sorry for delay! I just merged and published serialize-javascript@1.6.0. Thanks!