First entry in CONTRIBUTING.md

Notes about making database changes
Add patches directory
Update information on how to contribute patches
Merge branch 'master' of https://github.com/biocore/qiita into contributing_patches
Fix typo on 'Aproach'
MAINT:Change ontology term identifier to bigserial

The term identifier in the ontology terms table was set as a big int,
thus adding new user-defined terms was cumbersome, with this change in
place those the term is now a bigserial.

I have also changed the ontology file in the beast, so people WILL HAVE
to reload their databases.
ENH: Change old_term_id to default to NULL
Merge pull request #581 from ElDeveloper/autoincrment-term

MAINT:Change ontology term identifier to bigserial
Removing the study_id from the sample PK, and fixing populate.sql
Fixing small bug on logging the errors on the data object
Modifying the MetadataTemplate to prefix the sample names with the study id
Fixing the sample ids on the test OTU table
Modify analysis obj to reflect changes on the DB
fixing job tests
fixing search tests
fixing setup tests
Fixing remaining tests
Fixing support-files
Addressing comments
Merge pull request #536 from adamrp/contributing_patches

Contributing patches