[NXCM-5233] Add settings resource (retrieves divers settings about Nexus)

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
[NXCM-5233] Also load Nexus settings when status is loaded & disable Nexus pinging when "keepAlive" is false

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge pull request #205 from sonatype/NXCM-5233-no-session-timeout

REVIEW: [NXCM-5233] Introduce property to enable/disable session timeout from UI