pass in isFixedLength to KeyRange constructor
remove isFixedLength from KeyRange compare functions
rename ScanRangeIntersectTest to ScanRangesTest
Rename ScanKeyTest to ScanUtilTest, add more tests for variable length keys, fix bugs for formuting start/stop key
Merge remote branch 'upstream/master'

Conflicts:
	src/main/java/com/salesforce/phoenix/filter/SkipScanFilter.java
	src/test/java/com/salesforce/phoenix/filter/SkipScanFilterRangeSplitTest.java
SkipRangeParallelIteratorRegionSplitter and tests II.