Merge pull request #23 from llh1/master

Merge from llh1/master v1.4.0
Transferring blueprint from apiary.io
Transferring blueprint from apiary.io
added a read me to process_taxonomy script
Fixed DB connection in the script for taxonomies
Merge pull request #24 from ke4/add_readme_to_process_taxonomy

Added a read me to process_taxonomy script
Ensure records inserted as needed
Further memory restrictions
[fix #51559831] extraction_process to sample JSON
Permit taxon ID without scientific & common names
[fix #51559831] specs for BulkUpdateSample with extraction_process
Merge pull request #25 from ke4/51559831_add_an_extraction_method_attribute_to_update_sample

51559831 add an extraction method attribute to update sample
Unknown gender is a valid value for human gender
fix specs
Bump version to 1.5.1
Merge pull request #26 from llh1/51878791_unknown_in_human_gender

51878791 unknown in human gender
Add donor_id attribtue for cellular_material
Add donor_id column in cellular_material table
Update specs for donor_id attribute
Bump version to 1.6