iss286

Fix issue #286:
Support specification of the global paint rate (the rate at which feed-driven views poll for new data) at run-time. This is settable via both:

A key/value pair in a properties file
A system property set in command line arguments (e.g. -D)
If none of the above is provided, the default value is 250 ms.

Modified the following files:
FeedView, mct.properties

Wrote or re-wrote unit tests (Y/N): N
Ran entire suite of unit tests successfully (Y/N): Y
Verified bug fix with the described replication steps or verified the implementation meets the requirement cited (Y/N): Y
Code coverage requirements satisfied (new code=80%, changed code=at least as high as existing) (Y/N): N
Code review date and attendees: Code review by pull request
Describe potential impact on other areas of the code: startup
Describe any test prerequisites for this fix (e.g., restart the database): N
For bugs marked "Regression - Yes", describe the cause of the regression:
Did you modify any pom.xml file? If yes, did you thoroughly document your changes and reasons? N