I like this project, and...

[joshuakfarrar]

Dependencies haven't been updated since sbt 0.13.x; some artifacts required for running sbt test are unavailable.

After updating project/build.properties...

[info] Loading global plugins from /Users/ITMETHO/.sbt/0.13/plugins
[info] Loading project definition from /Users/ITMETHO/Developer/poi.scala/project
[info] Compiling 1 Scala source to /Users/ITMETHO/Developer/poi.scala/project/target/scala-2.10/sbt-0.13/classes...
[info] Resolving org.scala-sbt#interface;0.13.17 ...
[warn] 	[FAILED     ] org.scala-sbt#compiler-interface;0.13.17!compiler-interface.jar(src):  (0ms)
[warn] ==== local: tried
[warn]   /Users/ITMETHO/.ivy2/local/org.scala-sbt/compiler-interface/0.13.17/srcs/compiler-interface-sources.jar
[warn] ==== public: tried
[warn]   https://repo1.maven.org/maven2/org/scala-sbt/compiler-interface/0.13.17/compiler-interface-0.13.17-sources.jar
[warn] ==== local-preloaded-ivy: tried
[warn]   /Users/ITMETHO/.sbt/preloaded/org.scala-sbt/compiler-interface/0.13.17/srcs/compiler-interface-sources.jar
[warn] ==== local-preloaded: tried
[warn]   file:////Users/ITMETHO/.sbt/preloaded/org/scala-sbt/compiler-interface/0.13.17/compiler-interface-0.13.17-sources.jar
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn] 	::              FAILED DOWNLOADS            ::
[warn] 	:: ^ see resolution messages for details  ^ ::
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn] 	:: org.scala-sbt#compiler-interface;0.13.17!compiler-interface.jar(src)
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
sbt.InvalidComponent: Couldn't retrieve source module: org.scala-sbt:compiler-interface:0.13.17:component

https://mvnrepository.com/artifact/org.scala-sbt/compiler-interface lists no versions 0.13.x of compiler-interface, but 0.1.0-M3 references the 0.13 license.

Updating SBT to v1.2.4 results in dependency failures for sbt-pgp, ensime-sbt, and scalastyle-sbt-plugin; fixing these causes errors which must be f of deprecation.

[error] object Build extends Build {
[error]                      ^
[error] /Users/ITMETHO/Developer/poi.scala/project/Build.scala:28:13: type mismatch;
[error]  found   : Some[sbt.librarymanagement.MavenRepository]
[error]  required: sbt.Task[Option[sbt.librarymanagement.Resolver]]
[error]         Some("snapshots" at nexus + "content/repositories/snapshots")
[error]

[joshuakfarrar]

(Note: I would like to add support for addMergedRegion and merged regions.)