Adjust textarea rows attribute on user_groups/form
small refactor in models/deployment
destroy --> destroy! to force exception
unified buttons at frontend realms pages
add test for instance.launch!
prevent duplicit save in Taskomatic create_instance!
API: Datetime serializer according to XML Schema

Implements serialization for datetimes according to
http://www.w3.org/TR/xmlschema-2/#dateTime
API: Duration serializer according to XML Schema

Implements serialization for durations according to
http://www.w3.org/TR/xmlschema-2/#duration

The serializer only uses units upto days, which is permitted by the
standard. It doesn't use years and months because these units have a
relative length depending on what are they being added/subtracted
to/from, which would be undesirable for our use case.
Merge pull request #231 from jcoufal/fix_realm_buttons

Unify buttons at frontend realms pages
Simplifying provider_accounts form
New simple_form input: informative input
Simplifying providers form
Simplifying frontend_realms form
Typo fix.
Merge pull request #223 from ifarkas/simplifying_forms_r2

Simplifying forms (round 2)
API deployables: implement listing/#index
routes: add GET deployables to pools
factories: add pool_with_catalog_with_deployable
specs: request spec for deployables API #index
API deployables: XML view for #index/listing