Regression of pull request #73 : URL encoding method is invalid for non-standard job

Java-client-api version : 0.4.0-SNAPSHOT
Jenkins Server Version : 2.150.2

Latest version without Guava can't get xml config of a job with a space in its name:

org.apache.http.client.HttpResponseException: status code: 404, reason phrase: Not Found

at com.offbytwo.jenkins.client.validator.HttpResponseValidator.validateResponse(HttpResponseValidator.java:11)

at com.offbytwo.jenkins.client.JenkinsHttpClient.get(JenkinsHttpClient.java:170)

at com.offbytwo.jenkins.JenkinsServer.getJobXml(JenkinsServer.java:524)

Just looked at the code and since 0.4.0-SNAPSHOT with guava removal, a regression of pull request #73 occurs : job names with a space in them now contains the symbol "+" again, but there is an explicit comment in the latest code asking for the opposite
`// jenkins doesn't like the + for space, use %20 instead`

Start in JenkinsHttpClient.java around the request URL construction and then follow JenkinsServer.getJobXml, comparing the current encoding with the behavior described in pull request #73. Verify that job names containing spaces use %20 rather than + and that XML retrieval succeeds for a non-standard job name.

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