Changed AppDelegate to use a different jenkins instance. Created JenkinsInstance.findOrCreateJenkinsInstanceWithValues.

SyncManager:
- Disabled jobSyncTimer for testing.
- Added message for when done syncing jobs.
- Added call to syncCurrentJenkinsInstance after switching currentJenkinsInstanceURL
- Removed call to syncAllJobs after switching currentJenkinsInstanceURL
- Removed find/create logic from jenkinsInstanceDetailResponseReceived
reenabled jobSyncTimer. removed testSyncAllJobs since it does work in bg.