Add easy method to install example files into sharelib

Right now installing the oozie examples is cumbersome, and not very intuitive to new users, despite the fact that they are integral to a new user becoming familiar with how to construct workflows/coordinators/bundles.

Right now, in order to install all examples and have them be runnable right away the user has to (possibly) replace the jobTracker/YARN RM uri, as well as the headnode URI in each job.properties file (there are 20 or so different app examples). Also, in order to use coordinator/bundle examples the user must update a plethora of datetimes (although generating these in the examples could be considered out of scope and more difficult)

Personally, in my Bigtop with oozie 4.2.0 i'm using a script to untar the examples, replace all jobtracker and namenode uri's with ones passed in (or set in an install-oozie-examples-env.sh script), and then upload them into hdfs under the users account. This allows me to quickly install examples on cluster spin-up, and run them to verify oozies operability.

I'd like to open this to discussion of implementation details, as I'm not sure if this would be a change the Oozie community would be open to, or if anyone has any ideas as to the best way to implement this.