Small tweaks to website theme, bugfixes
Coordinator.java:
-adding a few new asserts for later unit testing

Prefs.java:
-fixed bug where the default serial port was being read from the value for the default web server port
-fixed null pointer exception if serial port is not defined in config file.

SimpleHttpServer.java:
-removed generic header paragraph
-added warning header paragraph that is only displayed if the default config file is being used.
-button to save preferences within the settings handler is disabled if the default config file is being used (re-enabled through javascript later)
-removed restart module links within each section, replaced with a single button to restart all modules
-increased transition delay in the waiting page generated by restart module handler if all modules are being restarted

index.css, template.html:
-small visual tweaks

main.js:
-updateConfigFile() checks if the given file name is 'coordinator.conf' or '' and disables the submit button if it is.