When querying for a contig which doesn't exist in SAMFileReader, return an empty iterator. This matches the behavior in BAMFileReader
Update TabixReader.java
Update TabixFeatureReader.java

Fix problem with open TabixReader after calling close() on the TabixFeatureReader
Merge pull request #65 from mremmert/patch-1

Correctly close underlying reader
Merge pull request #42 from jsilter/allow_empty_sam

Allow querying from contig which is not in file
Merge pull request #52 from marc-flesch/patch-1

Update TabixReader.java
Merge remote-tracking branch 'upstream/master'