Add export notice to README.md

As advised by Red Hat expert compliance officers, add export notices to README.md for ManageIQ source code in addition to the notice on the website.
Removed a warning message from automation log

We log a warning everytime a service model is not found. Which includes
basic ruby objects. e.g.
[----] W, [2014-06-20T13:01:03.092624 #3049:3fe521833bdc]  WARN -- :
Service Model string not found
Merge pull request #67 from dneary/patch-1

Add export notice to README.md
Merge pull request #84 from mkanoor/noise_in_log

Removed a warning message from automation log
Add support for service hierarchies

For multipart service deployments, parent/child
relationships between services can now be visualized
in the 'My Services' tree view.

The visibility of child services needs to be enabled
via the "display" attribute on MiqAeServiceService
for child services to appear in the hierarchy, by
default they are hidden. Also added an explicit
method for create new Service records via automation.

https://bugzilla.redhat.com/show_bug.cgi?id=1059834
Move RBAC descendant check to TreeBuilder to consolidate duplicate code.

Follow up to https://github.com/ManageIQ/manageiq/pull/81
https://bugzilla.redhat.com/show_bug.cgi?id=1086015
Merge pull request #120 from Fryguy/fix_ui_vm_summary_2

Fix UI vm summary performance (part 2)
Merge pull request #12 from dillaman/bz1059834-service-hierarchies

Add support for service hierarchies