Prepare for development of version 1.2.0.
Fix version in readme
Register.get_structure now only includes dates (misses first_name, last_name etc.)
Add GiftAid. closes #75
Update GiftAid to reflect OSM changes. closes #87
Add budgets. closes #76
Fix sorting of member
Correct docs for Event.get method.
Add invoices. closes #77
Add "Gold+" / :gold_plus subscription level. closes #100
Add "Personal details" to myscout_link method of member. closes #98.
Add myscout_link_key method to member.
Add getting My.SCOUT link to specific event. closes #95
Add My.SCOUT personal details to section. closes #97
Getting current term when their isn't one raises an Osm::Error::NoCurrentTerm instead of Osm::Error.
Add myscout_programme_show attribute to Section. closes #105
Update README.
Add attendance_reminder attribute to event. closes #96
Alolow sending SMS to multiple numbers. closes #103
Merge branch 'dev_v_1.2' into staging