Fixed Makefile and cleaned up README

[delbonis]

The Makefile didn't work on account of glit's libui dependency being weird, so I tweaked it a bit to make sure that it would at least build something. By default it's just lit and lit-af for now.

I updated the README to reflect these changes and just cleaned up the "getting started" part as a whole.

[Varunram]

Also, build fails due to seem weird reason:

3:37:21 ERROR: Build step failed with exception
23:37:21 java.io.FileNotFoundException: https://api.github.com/repos/mit-dci/lit/statuses/17af2a050683528ea4a3768ae2252c89c4c319f4
23:37:21    at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:243)
23:37:21    at com.squareup.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
23:37:21    at com.squareup.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:25)
23:37:21    at org.kohsuke.github.Requester.parse(Requester.java:612)
23:37:21    at org.kohsuke.github.Requester.parse(Requester.java:594)
23:37:21    at org.kohsuke.github.Requester._to(Requester.java:272)
23:37:21 Caused: org.kohsuke.github.GHFileNotFoundException: {"message":"Not Found","documentation_url":"https://developer.github.com/v3/repos/statuses/#create-a-status"}
23:37:21    at org.kohsuke.github.Requester.handleApiError(Requester.java:686)
23:37:21    at org.kohsuke.github.Requester._to(Requester.java:293)
23:37:21    at org.kohsuke.github.Requester.to(Requester.java:234)
23:37:21    at org.kohsuke.github.GHRepository.createCommitStatus(GHRepository.java:1075)
23:37:21    at org.jenkinsci.plugins.github.status.GitHubCommitStatusSetter.perform(GitHubCommitStatusSetter.java:160)
23:37:21 Caused: org.jenkinsci.plugins.github.common.CombineErrorHandler$ErrorHandlingException
23:37:21    at org.jenkinsci.plugins.github.common.CombineErrorHandler.handle(CombineErrorHandler.java:74)
23:37:21    at org.jenkinsci.plugins.github.status.GitHubCommitStatusSetter.perform(GitHubCommitStatusSetter.java:164)
23:37:21    at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:81)
23:37:21    at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
23:37:21    at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:744)
23:37:21    at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)
23:37:21    at hudson.model.Build$BuildExecution.post2(Build.java:186)
23:37:21    at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635)
23:37:21    at hudson.model.Run.execute(Run.java:1752)
23:37:21    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
23:37:21    at hudson.model.ResourceController.execute(ResourceController.java:97)
23:37:21    at hudson.model.Executor.run(Executor.java:429)
23:37:21 Build step 'Set GitHub commit status (universal)' marked build as failure
23:37:21 Setting status of 38416c69c07f78092f298249d6fdf1ed63251170 to FAILURE with url http://hubris.media.mit.edu:8080/job/lit-PR/145/ and message: 'Build finished. '
23:37:21 Finished: FAILURE

[metalicjames]

retest this please

[delbonis]

retest this please

[delbonis]

It'd be useful to update the Jenkinsfile to run make package and collect all the archives generated as some of build artifacts. But that's for another PR.

[delbonis]

Should be fine now.