Merge branch 'release/0.23.1' into develop
fix ineffective polymorphic_type in template
defer metadata (created. updated, active, version)
make scaffold static/download empty ignored dir
fixes #44
fixes #46, fixes clld/wals3#40
move py2/3 test to definition time
undefer updated where it is used
test coverage for undefer_cols option
deprecate mapper_name and more pythonic repr
test Base.__repr__
remove obsolete mapper_name
exclude active and version from json (cf. csv)
replace desc function with method calls
some refactoring
replace distinct by more effective subquery
make jsondump more flexible
add backref to contributor
add support for accessing metadata about files stored in imeji instances
Merge branch 'develop' of github.com:clld/clld into develop