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Merge pull request #40 from llh1/master

Merge from uat 1.8.2.pre
Transferring blueprint from apiary.io
Transferring blueprint from apiary.io
Fix documentation for get root
Add warning about bulk_create_sample deletion
Transferring blueprint from apiary.io
Transferring blueprint from apiary.io
Merge from uat 3.0.1.rc1
Merge pull request #46 from llh1/master

Merge from uat 3.0.1.rc1
Add disease_phenotype and age_band attributes in a sample
Specs
Fix migration number
Bump version
Merge pull request #51 from llh1/master

Add disease_phenotype and age_band attributes in sample
Merge hot fix disease_phenotype and age_band from master
Merge pull request #52 from llh1/uat

Add disease_phenotype and age_band attributes in sample