Merge pull request #57 from szarnekow/master

Add an option to the EObjectFormatter that allows to sort the features alphabetically
fixed a compile error in the content assist lexer
use lazy state container to handle test setups
fixed #53: NPE during editing of xt file
fixed #52: Rerunning of one expectation within a xt file causes a NPE
fixed #50: tests with contained escaped comment always fail
fixed test
avoid redundant execution of validation in validation test
fixed wrong path to token def file
created maven build
Run the tests in the build, too
Update README.md
avoid NPEs
re-enabled proper syntax highlighting
Don't let the multi-line-auto-edit-strategy insert "*"s in comments
this class should be public
fixes for syntax highlighting
support containers for Java projects
improved detection of installed Xtext languages
fixed #61: Support setup for Xtext languages without UI plugin