Update dependencies and fix tests for React 15

[thathenderson]

This updates peerDependencies after the changes in a50d53c, fixes a few nits in the example code, fixes a reference to renderToString() in the gulpfile, and updates the following things in a handful of tests:

• fixes references to unmountComponentAtNode()
• replaced all usage of getDOMNode() with ReactDOM.findDOMNode()
• fixes a DOM render warning about rendering td inside tbody

After these updates, there were no console warnings in develop mode, and all tests pass:

Let me know if the peerDependency semver range needs to change: I did 15.x.x because that seemed to emulate the expected range. Previously, since we were using ^0.14.0, and (I think) React was pushing minor and patches on the last digit, we would have gotten both. However, I'm up for whatever you guys think is best!

[thathenderson]

Any chance we could get this merged soon, @AlanFoster?

[thathenderson]

Bumping. Do you have a few minutes to take a peek @AlanFoster?

[ratson]

@AlanFoster React v15 has been released about a month and 2 patch releases were out, it should be stable enough to add support for it.

[thathenderson]

One more bump. Any project owners that could get this merged? I think React 15 support is something we would all like.

@jkimbo @AndrewIngram

[fluse]

@AlanFoster please merge branches!!!!!!!

[wmertens]

@AlanFoster I verified this PR and it works great. The only change is that npm doesn't complain any more in projects using react-daterange-picker. It is safe to merge 👍.

[AlanFoster]

@thathenderson @wmertens Thanks guys; Will try to get this in ASAP! 👍

[AlanFoster]

@thathenderson Thanks for the great work 👍

[ovidiuch]

@AlanFoster any plans to bump the pkg version and publish updates to npm? Looking forward to using it with React 15. Thanks.

[AlanFoster]

Thanks for the great work @thathenderson

This should now be available on npm as version v1.1.0 - let me know if there are any issues 👍

[thathenderson]

Will do, thanks for the merge @AlanFoster 👍