ACCUMULO-2234 Provide accumulo-site.xml to Mapper classpath and ensure is used by concrete Instance.
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT

Conflicts:
	core/src/main/java/org/apache/accumulo/core/client/mapreduce/RangeInputSplit.java
	src/core/src/main/java/org/apache/accumulo/core/client/mapreduce/InputFormatBase.java
	test/src/main/java/org/apache/accumulo/test/continuous/ContinuousVerify.java
	test/system/continuous/run-verify.sh