support a default name for projects
added launch configurations for build
make filename accessible
when executing "run as junit test" in a file or editor, only run that file and not all tests from the suite
fixed #137: Import files in ResourceSet setup with the given local file URI
re-enable tycho tests for example project
Several changes:

- added an extension point to register a default test suite for a 
  file extension
  
- if a suite is registered for a file extension, the XPECT_SETUP 
  section becomes optional
  
- inside the XPECT_SETUP section, the cross reference to the 
  test suite is now syntactically optional
  
- added support for system properties "xpectFiles" and "xpectBaseDir".
  they can override what has been specified via an 
  @XpectTestFiles annotation
  
- improved naming of launch configurations when .xt-files or 
  XPECT-statements are executed.
uncomment unused code
uncommented tests with behavoiur depending on an Xtext-version
make dependency to JvmModelINferrerRegistry optional since it's gone in Xtext 2.7.0
improve error reporting in case of exceptions
added target platforms for Xtext 2.6.2 and Xtext nightly
fixed #131: potential NPE
support classes with protected/private constructors for MetaAnnotations
fixed broken error reporting in case of conflicting extension points
improve error message if no test files are found
fixed #140: Running plugin tests inside eclipse still buggy (follow up on #109)
rearranged example to cover more use cases
use Java 7 for building releases
Have default implementations of ValidatingSetup and TargetSyntaxSupport