[#57] Add default_tags and default_extras handling
Merge branch '62-new-iso-fields' into 63-extend-spatial-harvesters
[#63] Add new ISpatialHarvest interface

Two extension points: ``get_package_dict`` and ``transform_to_iso``,
with the same expected behaviour as the old hooks meant to be overriden.

For ``get_package_dict`` we now pass, apart from the generated
package_dict, the parsed iso_values and the harvest object.

Updated docs and added autodocs.
Merge branch 'master' into 63-extend-spatial-harvesters
Merge branch 'master' into 63-extend-spatial-harvesters
[#63] Add user to delete context to avoid exception
[#63] Add previous_object check

In rare cases (eg if there was a previous error of two objects sharing
a guid) we can have a "changed" state and no previous_object
Merge branch 'master' into 63-extend-spatial-harvesters
[#63] Tweak docs
Avoid that url is interpretated as a pattern by zsh.
Describe how to change ownership in more detail.
[#62] Fix xpath for Alternate Title
Merge branch 'patch-1' of https://github.com/johnjohndoe/ckanext-spatial into johnjohndoe-patch-1
Merge branch 'johnjohndoe-patch-1'
Merge branch 'patch-2' of https://github.com/johnjohndoe/ckanext-spatial into johnjohndoe-patch-2
Merge branch 'johnjohndoe-patch-2'
Merge branch 'master' of https://github.com/tomkralidis/ckanext-spatial into tomkralidis-master
Merge branch 'tomkralidis-master'
Merge branch 'master' into 63-extend-spatial-harvesters
[#69] Reindex dataset if harvest object did not change

We replace the old harvest object with the new one, and if we don't
reindex the reference to the old harvest object will remain in the
dataset dict