#48 move OnHeapStore to use o.e.i.c.CHM
#48 add random sampling to CHM
#48 add capacity eviction to OnHeapStore
#48 Add test coverage for eviction prioritizers
#48 add javadoc for the new eviction store configuration parameters
Merge pull request #91 from chrisdennis/issue-48

Issue 48
Just the code changes (no unit tests yet).