M156: add conditional persisted_version update during deserialization
Added coverage datastore to container
Bumped ion-definitions
Merge pull request #486 from mmeisinger/add114_coveragesq

CIDEVSTC-114: Added coverage datastore to container
Enhanced object performance test
Add as_dict to DotDict
Message encode interceptor now handles IonObject; disable codec
Move validate.settattr config and remove codec interceptor
Bumped ion-definitions
M156: fix obj generator to keep TypeVersion as int
Merge pull request #484 from mmeisinger/fix1786_perf

OOIION-1786: Make message encoding interceptor more efficient
Merge pull request #482 from pkediyal/schema_versioning_final

M156: add conditional persisted_version update during deserialization
OOIION-1787: Support performance enhancements
Use json for dumps
Merge pull request #487 from mmeisinger/fix1787_extsize

OOIION-1787: Support performance enhancements