Updates to the maven configuration.
Ready building on Java8 as soon as JaCoCo is ready.
Javadoc for the TimeSpreadExpiration.

Conflicts:
	src/main/java/stormpot/TimeExpiration.java
	src/main/java/stormpot/TimeSpreadExpiration.java
Remove superfluous javadoc tags from tests.
Put the ResizablePoolTests into the PoolTest class.
Port some test changes over from the executors branch.
Port over some more changes from the executors branch
Update license headers