Fix exception catching in ag_data_access
Merge pull request #582 from adamrp/fix_geocode_except

Fix exception catching in ag_data_access
Updated FAQ about sending in multiple samples

now recommends sending in each sample one at a time.
fixes #583
Merge pull request #584 from teravest/issue583

Updated FAQ about sending in multiple samples
Merge branch 'master' of git://github.com/qiime/qiime_web_app into issue_568
Removed 'log sample' link from participant menu list and added logic so that top level 'log sample' link doesn't show up if there are no barcodes left.