Squashed 'core/' changes from c917697..a4154a2

a4154a2 Changelog update
9d98b7c Merge branch 'develop' of github.com:syncany/syncany into develop
563bcbb Merge branch 'feature/actions' into develop
6952704 Delete temp action files
ae8274b Documentation
4a0a5ae Update CHANGELOG.md
f009c72 Implements deletion of old ActionRemoteFiles of other clients after 8 minutes; relates to #64
7eec496 Implements action renewal every 2 minutes
5733ef0 Move operations to their own packages
a5278e3 Test for actions; relates to #64
54a9f23 Add working removeLostMultiChunks() to CleanupOperation; not sure about the semantics of cleanup though
1b2090a First attempt to delete unused remote multichunks; not working
7ffb398 Move CleanupOperation to its own package.
daf2fa2 Introducing the ActionRemoteFile to prevent cleanup during up/down; works for local plugin; relates to #64
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: a4154a2eda5d11442f49d0e73379f6bbb5f41262
Merge commit 'dea4f48140fe263ffc0594517ec0d032e2672ac3' into develop