Situations now point to (rather than embed) a SituationMention

to mirror the behavior of Entity, EntityMention, and EntityMentionSet
(*MentionSet embeds the *Mentions and the *s point to those *Mentions)
bumped version to 1.0.12-SNAPSHOT
Merge branch 'master' of github.com:hltcoe/concrete
add google gson dependency
Merge branch 'master' of github.com:hltcoe/concrete
JsonUtil.java added as a wrapper class and utility for handling Concrete manipulation, reading and serialization.
Merge pull request #15 from tturpen/json-utility

JsonUtil.java added - thanks @tturpen
Adding metadata field. Only to be used by those who know what it is for.
Changing metadata field for KeyValue mesage type.
Changing metadata field for KeyValue mesage type.
Merge pull request #16 from tturpen/master

Metadata Field for Concrete Protobuff
killed travis stuff
bump up versions to 1.0.13 SNAPSHOT
prepare for 1.0.13
bump versions to 1.0.14-SNAPSHOT
concrete.proto revisions including requiring section to have a king, sections getting an optional label and sections getting a position identifier that indicates where in the document the section appeared with respect to other sections.
Merge pull request #17 from tturpen/master

Changes to the concrete.proto
Additions to JsonUtil.java, partial update of new kind and section changes.
Fix protobufs not compiling
Prepare v1.0.14