Update gradle and add jfx plugin

[AustinShalit]

closes #636

Updates gradle to 2.14.1 and also setup the jfx plugin to replace the shemnon javafx plugin

[codecov-io]

Current coverage is 57.75% (diff: 100%)

Merging #637 into master will increase coverage by 0.06%

@@             master       #637   diff @@
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  Lines          6062       6062          
  Methods           0          0          
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  Branches        551        551          
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+ Hits           3497       3501     +4   
+ Misses         2401       2398     -3   
+ Partials        164        163     -1   

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[AustinShalit]

Tested the task :ui:jfxNative on both Mac and Windows. Works as expected

[JLLeitschuh]

Thank you! I would have forgotten this!

[JLLeitschuh]

Has this been tested on a windows system?

[SamCarlberg]

@JLLeitschuh Looks like it

[AustinShalit]

Tested on:

• Mac
• Windows x32
• Windows x64
• Linux (Fails in the same way master does - Cannot launch GRIP through .deb package - Linux #566)

[AustinShalit]

@ThomasJClark,
If you have a few minutes to lend a hand, I am having trouble getting GRIP to assemble on Ubuntu. Here are the steps I am taking right now to try to get GRIP to assemble:

1. I built ntcore locally using the parameter makeDesktop (./gradlew publish -PmakeDesktop)
2. I copied the NetworkTables-3.0.0-SNAPSHOT-desktop.jar artifact into core/libs and modified my build.gradle to match the one in Fix std::thread thing on linux by vendoring NetworkTables #402
3. I assemble grip (./gradlew jfxNative)

When I run the GRIP executable, I get this message in my console:

terminate called after throwing an instance of 'std::system_error'
  what():  Enable multithreading to use std::thread: Operation not permitted

When I run the GRIP jar that is put in the executable GRIP runs as expected.

If you could give me some advice on what I am doing wrong I would really appreciate it!
Thank you,
Austin

[SamCarlberg]

This is why I hate that network tables doesn't have a pure Java version

[JLLeitschuh]

@AustinShalit This is expected. @ThomasJClark had a version of Network Tables that he built himself. This needs to be fixed before our next release probably.
This is fine for now though.

[AustinShalit]

@PeterJohnson do you have any thoughts on how to get this to work?

[PeterJohnson]

We know this error is due to a missing -pthread flag somewhere when either compiling or linking but it's not clear where it's being left out since we updated the ntcore build to supposedly put it in. I have an Ubuntu system so I will give this a try tonight to see if I can reproduce it.

[AustinShalit]

Ok. Thank you!

[PeterJohnson]

The underlying issue is that the GRIP executable is simply a copy of a standard one that doesn't link to libpthread. While LD_PRELOAD can be used to work around the issue, the right solution is to compile the GRIP executable with -pthread from this source code: http://hg.openjdk.java.net/openjfx/8u-dev/rt/file/fe6b492b9150/modules/fxpackager/src/main/native/launcher/linux/launcher.cpp
(e.g. g++ -o GRIP -pthread launcher.cpp -ldl)