Update symfony dependency, fix #1094 : XMLHTTP responses are cached under IE7
Use system composer if present
Update locales
Fix #1090 : feed entry mail notification
Fix #1103 : Read receipt are not requested anymore for push and validations
Merge pull request #317 from romainneutron/3.7.7

[3.7.7] latest fixes
Bump to version 3.7.7
Fix #1118 : API does not return records starting at right offset
Fix #1041 Keep video aspect ratio when extracting thumbnail using canva
Update Imagine and Media-Alchemyst dependencies
Merge pull request #319 from romainneutron/api-offset

[3.7] Fix #1118 : API does not return records starting at right offset
Use --prefer-source for travis composer installation
Revert comparison
Remove ratio = 1 as default
Fix #1107 : Add caption and preview to order manager
Fix #1124 : Rollover pictures lost their ratio
Merge pull request #323 from romainneutron/fixes-3.7.8

[3.7] Fixes 3.7.8
Merge pull request #320 from nlegoff/fix_1041

[3.7] Fix #1041 Keep video aspect ratio when extracting thumbnail using canva
Fix sub views substitution
Subsitution cleanup && test enhancement