Created the templates and images tutorial. Added also a new start topology.
Added the tutorial to the tutorial list
Merge pull request #723 from swuest/templates_images_tutorial

Created the templates and images tutorial
Wrote the device and data access tutorial
Added the simulation for the tutorial
Changed start topology
Added tutorial to tutorial index list
Changed directory name to device_data_access cause this tutorial should cover both. Also made some typo fixes in steps.js
Deleted old directory
Fixed typos and other expression errors
New Icon
Fixed some typos. Added links to helppages for external networks. Removed the TODO in the link_emulation with the needed check.
Merge pull request #725 from swuest/device_access_tutorial

Device access tutorial
Merge pull request #728 from swuest/chat_link_tut_help_pages_add

Added Helppages and made some fixes to Chat and Link Emulation tutorial
card layout for organizations
loadbusy is now also used in the create topology link in the navbar
loading gif preloading now happens automatically when the js is added to the html
Merge pull request #731 from t-gerhard/topology_indicator_fix

Topology indicator fix
fixed template window cancel button so that it wont save changes
disabled template change button in config window while template_change action is still running