Get more than one error to display on error log
Add link to /error/ on error.html if user is admin

Fixes #625
Change default value on error_log.html

Now displays the current number of entries rather than always 100
Merge pull request #626 from adamrp/link_to_error-issue-625

Show more than one error on error_log.html
Merge branch 'master' of https://github.com/biocore/qiita into issue_624
addressing @adamrp comments