Adding EmailValidator + test class
Merge branch 'quick-fix' into gui
add clean plugin panel management
add internationalisation support in util class
Merge branch 'quick-fix' into gui

Conflicts:
	syncany-util/src/main/java/org/syncany/util/I18n.java
Merge branch 'gui' of https://github.com/binwiederhier/syncany into gui

Conflicts:
	syncany-gui/build.gradle
	syncany-gui/src/main/java/org/syncany/gui/Launcher.java
	syncany-gui/src/main/java/org/syncany/gui/wizard/NewEmailDialog.java
	syncany-gui/src/main/java/org/syncany/gui/wizard/NewSummaryDialog.java
	syncany-gui/src/main/java/org/syncany/gui/wizard/StartDialog.java
Removing 'syncany-plugin-gui'