Improved AlignmentProtoHelper.

(alignment.toProto().toAlignment() == alignment)
except in the read sequence, as it is not stored in the proto.
Added a small sam of 1000 lines.
Improved toAlignment and added test.
Added  AlignmentRegion HbaseDataWriter Test.

It will help to know how much space will use a whole sam.
Merge branch 'develop' of https://github.com/j-coll/opencga into develop

Conflicts:
	opencga-storage/src/main/java/org/opencb/opencga/storage/alignment/AlignmentProtoHelper.java
	opencga-storage/src/main/java/org/opencb/opencga/storage/alignment/AlignmentRegionHBaseDataWriter.java
Added snappy to AlignmentRegionHBaseDataWriter.