name attribute in planning_element_journal in apiv2 was accidentely written as an xml namespace
be sure to use iso8601 times in api v2
rename 'name' to 'subject' and 'end_date' in 'due_date' in planning_element api to be consistent
changelog entry

[ci skip]
allow updating types for planning_elements again
there is no planning_element_type anymore when creating work_packages in v2
Fixes specs
Fixes cukes
Adapts identifier methods
Renames 'end date' to 'due date'
tests for time comparisons.
Fix globalize3 dependency: specify branch
Merge pull request #502 from opf/fix/globalize_branch

Fix globalize3 dependency: specify branch
replaces bundled svg graph with gem
adds missing html_safe
Renames further 'end date' references
Removes superfluous locals
Renames permitted param
updates changelog
removes timelines_journals_helper - used nowhere any more