Merge branch 'hotfix/0.21.21'
Merge branch 'hotfix/0.21.22'
Prevent unnecessary FS access when building log templates

Previously, each addon was opening the _log_templates.mako in
append mode. This may have resulted in a race condition that
caused the file to be written in an incomplete state.

This patch ensures that _log_templates.mako is only opened
once at run time.

Attempt to fix #1341

thanks @lyndsysimon for looking this over with me
HTML-escape fields passed to revision table in Mako.
Fix download link in freshly uploaded files.

Thanks @caneruguz for catching this.
Merge branch 'hotfix/s3-keys'
Pressing the disable addon link now sends a POST request which actually
disables the addon.
Add in a bootbox on fail
Use $.osf.postJSON
Spacing fix
Merge branch 'hotfix/0.21.23'
Merge branch 'hotfix/0.21.23' into develop
Log to Sentry via Raven on failure
Merge branch 'hotfix/0.21.24'
Merge branch 'hotfix/0.21.24' into develop
Merge branch 'hotfix/0.21.25'
Merge branch 'hotfix/0.21.25' into develop
Fix typo in Dataverse file rendering.
Merge branch 'hotfix/0.21.26'
Merge branch 'hotfix/0.21.26' into develop