Change uses for EquivalentContentResolver to take app config
DefaultEquivalentContentResolver resolves only one of precedent source
add resolveAliases method to DefaultEquivalentContentResolver
Don't prematurely source filter in DefaultEquivalentContentResolver
Set equivalent-tos on Content in DefaultEquivalentContentResolver
Filter removed content refs from equivalence refs set
Merge pull request #115 from atlasapi/mbst-7547-equiv-single-item

DefaultEquivalentContentResolver resolves only one of precedent source