hard-code autocompletion limits to 20
Merge branch 'experimental' of github.com:nbargnesi/rest-api into experimental

Conflicts:
	java/src/org/openbel/rest/common/AnnotationKeywordCompletion.java
	java/src/org/openbel/rest/common/AnnotationValueCompletion.java
	java/src/org/openbel/rest/common/NamespaceCompletion.java
	java/src/org/openbel/rest/common/NamespaceKeywordCompletion.java
	java/src/org/openbel/rest/common/NamespaceValueCompletion.java