Update Spelling in Readme.md
Change some annotations
• Change startup beheaviour of the application:
  If a second instance will be started the window of the first instance
	will be toggled (and not shown). Now, it's possible to map the
	toggle-window shortcut on the same key binding as the
	(external) application start.
• Add new config file option: show_on_startup
Add system wide search for config file and asset folder. This is
a preparation for the install option in Makefile.
Add install and unistall option to Makefile
Anpassung des READMEs
Swap selected build types between all and release target
Merge branch 'master' into refactoring

Conflicts:
	src/config-manager.vala
	src/main.vala
	src/neo-window.vala
	src/unique.vala
Update .gitignore