Squashed 'core/' changes from c917697..e0645a9

e0645a9 Merge feature/userinteraction; closes #127
ef25f7c Merge branch 'feature/userinteraction' into develop
833f4c4 Add newline before password
b582bdd User interaction cont'd; centralized interaction at AbstractInitCommand and UserInteractionListener
4a903ae Update CHANGELOG.md
8689597 Extended user interaction for plugins; beginning (works)

git-subtree-dir: core
git-subtree-split: e0645a9a9f31dd05c87f4c049ea5bc1e145d11c3
Merge commit '0794485ae87f943574edc5e778124a59594fb9e6' into develop
Fixes syncany/syncany#128