Limit file upload and download sizes

[hortongn]

1. Limits uploads to 3 GB per file
2. Limits downloads to file < 3 GB. Larger files will instead show a request link that composes a contact form message.
3. Adjusts the description for cloud provider uploads so users better understand it.
4. Video and audio files did not previously have a download button. This adds it.

To test the upload limit locally, you can lower the maxFileSize variable in app/assets/javascripts/sufia/uploader.js to something much lower than 3 GB.

To test the download limit locally, you can lower the max_file_file variable at the bottom of app/helpers/file_set_helper.rb to something much lower than 3 GB.

[coveralls]

Coverage increased (+0.02%) to 98.382% when pulling 8d3110f on feature/#1055-limit-upload-download into e52398b on develop.

[scherztc]

2.1 GB file attached correctly in jquery uploader but when trying to submit the work, I got a SOLR error:

RSolr::Error::Http in CurationConcerns::VideosController#create
RSolr::Error::Http - 400 Bad Request Error: 'ERROR: [doc=7s75dc71j] Error adding field 'file_size_is'='2256609140' msg=For input string: "2256609140"','code'=>400}} URI: http://127.0.0.1:8983/solr/hydra-development/update?wt=ruby&softCommit=true Request Headers: {"Content-Type"=>"text/xml"} Request Data: "<field name="system_create_dtsi">2017-04-11T17:23:23Z<field name="system_modified_dtsi">2017-04-11T17:23:24Z<field name="has_model_ssim">FileSet<field name="id">7s75dc71j<field name="creator_tesim">admin@example.com<field name="creator_sim">admin@example.com<field name="accessControl_ssim">614bff15-90b0-4ab5-a4ed-7a8c2824179b<field name="depositor_ssim">admin@example.com<field name="depositor_tesim">admin@example.com<field name="title_tesim">woodmanc_dharmapops_2014.mov<field name="title_sim">woodmanc_dharmapops_2014.mov<field name="date_uploaded_dtsi">2017-04-11T17:23:23Z<field name="date_modified_dtsi">2017-04-11T17:23:23Z<field name="thumbnail_path_ss">/assets/default-f936e9c3ea7a38e2c2092099586a71380b11258697b37fb4df376704495a849a.png<field name="hasRelatedMediaFragment_ssim">7s75dc71j<field name="hasRelatedImage_ssim">7s75dc71j<field name="label_tesim">woodmanc_dharmapops_2014.mov<field name="label_ssi">woodmanc_dharmapops_2014.mov<field name="file_format_tesim">quicktime (Quicktime, ISO Media, Apple QuickTime movie, Apple QuickTime (.MOV/QT))<field name="file_format_sim">quicktime (Quicktime, ISO Media, Apple QuickTime movie, Apple QuickTime (.MOV/QT))<field name="file_size_is">2256609140<field

[scherztc]

Merging and creating separate issue for SOLR error.