support enum name:type syntax
Improved handling of block declarations
Merge pull request #89 from Cmejia/master

Improvements to block expression recognition
added RDF/Turtle grammar folder,
copied basic grammar from turtle reference page.
fixed Grammar entry point.
Ignoring Eclipse, and maven auto-generated files.
Working TURTLE grammar (may need more tests).
Optimized switched quotes cases.
Merge pull request #91 from amedranogil/master

Add Turtle/RDF grammar
added licenses, and to modules in parent pom.
Merge pull request #92 from amedranogil/master

Turtle/RDF: added licenses, and to modules in parent pom.
update to 4.3 syntax
Merge branch 'master' of github.com:antlr/grammars-v4
read actions more accurately