Correctly set Method & Reference when uploading Samples
New related Sample should't inherit source
Hide Parent MD5 field when uploading "related" Samples
Use new-sample form, instead of add-attachment, when adding Email attachment
Display Sample upload errors inside form.
Change parent_xxx to related_xxx for default "related_to" relationships
Improve validation of related Sample uploads
Consistently copy Campaigns during related Sample upload
Fix "Email Me Results" function of Sample upload
Fix Sample relationship forging for .rar/.zip
Improve unzip/unrar Method & inherit Campaigns during Unrar
Distinguish file/metadata Sample uploads in Method field
Make Source inheritance a Sample upload form option
Make Campaign inheritance a Sample upload form option
Fix redirect bug.

Make the javascript look for a redirect_url key, and if it exists, use it.

Make all the places that were using redirect.html just put the URL in the
response.

Since nobody is now using redirect.html, remove it.

See discussion in #131.
Merge branch 'pr/131'