Minor alteration to util.py error output
Merge branch 'master' of https://github.com/picrust/picrust
Remove test failing comma from generated_by string in BIOM

Addresses #71

Note that after this bug is fixed in BIOM the original generated_by
string can be used and tested.
Update warning and option usage for low/high memory machines for predict_metagenomes.py
Merge pull request #73 from mlangill/doc_memory_usage

Update documentation for metagenome prediction tutorial.
Merge pull request #72 from mlangill/issue71

Remove test failing comma from generated_by string in BIOM
Addresses Issue 70: Fixes descrepencies between tree and trait table based on quoted node names
Addresses Issue #70 Test code for fix to assign_traits_to_tree
Merge pull request #74 from zaneveld/issue_70_quoted_node_names

Issue 70 quoted node names produce an error in predict_traits.py
Update version in all scripts from 0.0.0-dev to 0.9.0
Add .gitattributes to create cleaner release download