Update to 9.1.4

Changelog:
Version 9.1.4 Feb 2 2017

    [major] Make error message for password reset form more generic - core/#27011
    [major] When sharing autocomplete is disabled, also disable for the email field - core/#26504
    [major] Add command to clean up invalid/expired remote storages - core/#26379
    [major] Fix encryption key storage when using LDAP home folder rules - core/#26820
    [major] Properly react on memcache errors - core/#25692
    [major] Fix random normalizedPathCache log messages / garbage collection issues from PHP 7 - core/#22370
    [major] Properly deal with inconsistent LDAP/memcache or user/group manager responses - core/#26871
    [major] Added configreport app which will help with better bug reports - configreport/#6
    [minor] Fix syncing of file names with colon followed by a number - core/#25479
    [minor] Prevent empty user uid from LDAP - user_ldap/#6
    [minor] Prevent repeated log messages when dealing with broken picture files - core/#26758
    [minor] Fix group-enable option in apps page when memcache is enabled - core/#26638
    [minor] Add AVMaxFileSize config option - files_antivirus/#133
    [minor] Reduce number of federated share requests when dealing with non-existing entries - core/#26324
    [minor] Remove obsolete legacy storage repair routine - core/#26774
    [minor] Fix broken remote avatar image in activities tab - activity/#529
    [minor] When grouping duplicate shares, sort by stime then id - core/#25830
    [minor] Make file upload post hooks consistent between chunking and non-chunking mode - core/#26387
    [minor] Fix wrong German translation in upload progress bar by using momentjs library - core/#26804
    [minor] Skip unavailable storages in background file scan instead of failing - core/#26055
    [minor] Update PHP 7.1 incompatibility warning - core/#26982
    [minor] Warning notification when uploading 4+ GB file in IE11 - core/#27004

(ryoon)