Batch of fixes
 - PL-127: Add the rest url to the jersey plugin as a info.
 - PL-128: RestAPI plugin is very big, try and remove unnecessary libraries
 - PL-43: Marketplace: add number of available plugins for each category
 - Corrected jarxs annotation in Plugin class
Merge pull request #25 from bestmazzo/pl-128

Batch of fixes
Updated Jersey pom.xml to solve a regression
Jersey API: Fix the swagger build directory
Change the minimun jdk version to be 1.7
Solved core-465, partially solved core-457
 - core-465: introduced PluginStatus enum in order to better manage Plugin life cycle
 - core-457: introduced unsubscription procedures for Events and Commands.
 - core-457: TODO - manage (un)subscriptions with life cycle.
mavenization of bluetooth-id plugin