Add "brief" field into album, add templatetag which can print "brief" as image alt
Alt generator: increase reliability, improve tests, update docs
Alt generator: python 3 compatible
Merge pull request #41 from lampslave/master

Add field into album, add tag which can print that field as image alt
fixed migrations

Give users only existent permissions from imagestore app, because Album/Image model can be overriden
Remove adding place field to Image model. Should be added by project owner if needed
Merge remote-tracking branch 'upstream/master'