Upgrade package to avoid travis error.

[jkmarx]

• Could not pinpoint the issue with jsDoc, but following link recommended we upgrade to 2.2.0 to address issues for Node v8.5.0. Even though we have 6.11.0, it fixed the issue. Note, in the next milestone we are upgrading node to v8+ anyhow.
  Update grunt-jsdoc dependency to 2.2 to fix jsdoc issues in node 8.5 and later dc-js/dc.js#1351

https://www.npmjs.com/package/grunt-jsdoc

Running "jsdoc:dist" (jsdoc) task
>> /home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/lib/jsdoc/fs.js:97
>>     fs.copyFileSync(inFile, path.join(outDir, fileName));
>>        ^
>> 
>> TypeError: fs.copyFileSync is not a function
>>     at Object.exports.copyFileSync (/home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/lib/jsdoc/fs.js:97:8)
>>     at staticFiles.forEach.fileName (/home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/templates/default/publish.js:506:12)
>>     at Array.forEach (native)
>>     at Object.exports.publish (/home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/templates/default/publish.js:502:17)
>>     at Object.module.exports.cli.generateDocs.e [as generateDocs] (/home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/cli.js:441:39)
>>     at Object.module.exports.cli.processParseResults (/home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/cli.js:392:24)
>>     at module.exports.cli.main (/home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/cli.js:235:18)
>>     at Object.module.exports.cli.runCommand.cb [as runCommand] (/home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/cli.js:186:9)
>>     at __dirname (/home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/jsdoc.js:92:9)
>>     at Object.<anonymous> (/home/travis/build/refinery-platform/refinery-platform/refinery/ui/node_modules/jsdoc/jsdoc.js:93:3)
>>     at Module._compile (module.js:570:32)
>>     at Object.Module._extensions..js (module.js:579:10)
>>     at Module.load (module.js:487:32)
>>     at tryModuleLoad (module.js:446:12)
>>     at Function.Module._load (module.js:438:3)
>>     at Module.runMain (module.js:604:10)
Warning: jsdoc terminated with a non-zero exit code� Use --force to continue.

[codecov]

Codecov Report

Merging #3373 into release-1.6.9 will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           release-1.6.9    #3373   +/-   ##
==============================================
  Coverage          68.58%   68.58%           
==============================================
  Files                372      372           
  Lines              24284    24284           
  Branches             942      942           
==============================================
  Hits               16655    16655           
  Misses              7629     7629

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