Add connecting bonds and atoms
Merge branch 'master' into identify-connectors
Added the connecting bonds method
Broke up appendAtomSet method.
connecting bonds working
Merge branch 'master' into identify-connectors

Conflicts:
	src/main/java/io/github/egonw/CMLEnricher.java
Clarified difference between external and connecting bonds/atoms.
Annotations for connecting bonds.
Annotations for connecting bonds.