setting header on the beginning of the method to prevent Access-Control-Allow-Origin problem when path is not found
added org.foam.orion.server to gradle build
changed compatibility to java 1.6
better error message
removed unneeded check for absolute file path
added PropositionalLogicParserTest
fixed bug in parser operator precedence
increased memoryMaximumSize option because the build was non-deterministically killed when compiling Xtend code
simplified API of IterableExtensions
now there is only a single transitiveClosure() method
fixed broken test
simplified tests - *Checker classes replaced with EcoreUtil.equals
Merge branch 'master' into ucm-parser-refactoring

Conflicts:
	org.foam.transform/test/src/org/foam/transform/junit/utils/UcmChecker.xtend
removed UcmChecker (empty file after merge)
fixed compilation error