Bugfix for serializing complex to double
Merge, get ready for 1.5.12
Commit to release 1.5.12
Added tag 1.5.12 for changeset 8b6dff7bab62
Fix a dependency number on fsharp nuspec
Update version, to create packages for an alternate channel for distribution via NuGet
Added tag 1.5.13 for changeset 747c7254a2b1
Protect the call list and the result of an evaluated call from GC.
Commit to release 1.5.14,  with a fix from @dcharbon for an issue that appeared in Deedle
Added tag 1.5.14 for changeset 72d052496ff3
Change description in nuspec
Fixup for crash on exit due to dev.off() call
Added correct graphics proj ref
Initial stab and reordering environment variable logic.
R_HOME usage improvements