New upstream version 0.13.3

.travis.yml

README.md

core/pom.xml

core/src/main/java/com/github/jsonldjava/core/Context.java

core/src/main/java/com/github/jsonldjava/core/JsonLdApi.java

...java/com/github/jsonldjava/core/ContextRecursionTest.java

...t/java/com/github/jsonldjava/core/DocumentLoaderTest.java

...test/java/com/github/jsonldjava/core/JsonLdToRdfTest.java

pom.xml