Replace GARead with GAAlignmentRecord
added a few more fields and comments
renamed GAAlignmentRecord and made closer to SAM
TAB => SPACEs
More comments
Merge remote-tracking branch 'upstream/master' into AlignmentRecord

Conflicts:
	src/main/resources/avro/reads.avdl
Renamed a few fields; added one comment
Merge pull request #60 from lh3/AlignmentRecord

Replace GARead with GAReadAlignment