add resultset for new DesignTarget table
remove design_type from design targets table
add create_design_target function and tests for this function
add method to find designs for given design target, plus tests
Merge branch 'devel' into design_targets_table
add new ensembl_gene_id column to design targets table, rename exon_id column
add db migrate 34, add design_targets table
Merge branch 'devel' into design_targets_table
fix typo