HystrixThreadPool shutdown methods

https://github.com/Netflix/Hystrix/issues/102
Fix wiki links in README.md

Fix some of the wiki links likely broken by recent Github changes.

See:
 * https://github.com/blog/1395-relative-links-in-markup-files
 * https://github.com/github/gollum/issues/236
Merge pull request #107 from joshmoore/patch-1

Fix wiki links in README.md
fixing links

Github changed things recently so relative links are no longer working, changing to absolute.
Update README.md
Update README.md
Hystrix.reset for lifecycle management

I'm changing the design from the previous commits so it's more abstract and can handle any type of resources needing cleanup, not just threadpools.

https://github.com/Netflix/RxJava/issues/45
stop using HystrixCollapser/reset-collapser

See https://github.com/Netflix/Hystrix/pull/106 and https://github.com/Netflix/Hystrix/issues/102
Merge pull request #108 from benjchristensen/issue-102-clj

stop using HystrixCollapser/reset-collapser
make reset methods package private not public
Merge pull request #106 from benjchristensen/issue-102

HystrixThreadPool shutdown methods
Version 1.2.8
1.2.9-SNAPSHOT