Use Mockito to fake a HTTP client and check accept headers
Conflicts:
	core/src/test/java/com/github/jsonldjava/utils/JSONUtilsTest.java
Test URL caching
Caching of HTTP content (e.g. @contexts)
manage dependency versions
make changes to synchronisation and test setup per pull request
suggestions
Merge branch 'stain-uri-caching'
Add eclipse source formatting and cleanup style files