fix mac build issue for tracevis

[aman1309]

Upgrading phantomjs to solve one of the build issue in testCov, fails on mac only since c++ libs used to build are different on mac. Other issues relating to installation failure:

Root cause is contextify being no longer support as it is merged native to node.
Permanent fix is upgrade node and package dependencies.

for now will have use below patches(one time). I will add specific cmds to developer guide.

Refer:
nodejs/node-gyp#569
nodejs/node-gyp#469

[junchuanwang]

After offline chat, this looks good to me. Maybe reword the description to explain a little bit about the relationship between this version bump and commands you are going to add to the developer guide.

[mchen07]

For my own understanding, what does ^ mean here? 2.1.7 or above?

[aman1309]

equivalent to 2.*
~2.1.7 is 2.1.*

[mchen07]

I see. Thanks.

[evanw555]

I would advise that you leave a note in the README.md file for :parseq-tracevis showing the exact commands needed to fix this. Not everyone has access to our internal development guide, plus this would make the information easier to access for anyone trying to build parseq.

[aman1309]

I would advise that you leave a note in the README.md file for :parseq-tracevis showing the exact commands needed to fix this. Not everyone has access to our internal development guide, plus this would make the information easier to access for anyone trying to build parseq.

I think we should add a dev guide which can include this, will add this task in queue