Merge eval_dev branch to master

[chunseoklee]

'require' function in iotjs need eval feature which is not supported by current jerryscript/master branch. Thus, eval_dev should be merged into master.

[ruben-ayrapetyan]

The eval_dev branch contains temporary implementation of eval, prepared because eval functionality is necessary for iotjs development.
The branch isn't supposed to be merged into master.

We are currently working on another, comprehensive eval implementation, that would be merged into master.
Until new implementation is done, please, use the eval_dev branch.

If it is necessary, we could rebase eval_dev on current master branch.

[chunseoklee]

OK.
Until eval implementation is done, I will work on eval_dev branch.
Please rebase eval_dev.

[ruben-ayrapetyan]

eval_dev is rebased.
Please, check.