updated ImagesIndexer to inherit from AbstractIndexer and to batch get
the observations from the observation server and batch commit to the
impc_images core. Needs testing!!!!! Previous version worked....
could refactor so not using prepared statement but sql as a map - but as
only takes 4-6minutes to run currently anyway...
Merge branch 'master' of https://github.com/mpi2/PhenotypeArchive.git