Adopt R.NET 1.5.15

Adopting R.NET 1.5.15 for GC fix.
Merge pull request #99 from dcharbon/master

Adopt R.NET 1.5.15
Fix assembly resolving to not interfere with loading FSharp.Core.resources, fixing #97
Merge pull request #101 from cdrnet/fix-resolving-resources

Fix assembly resolving to not interfere with loading FSharp.Core.resources, fixing #97
Add FSharp.Core dll, optdata, and sigdata to nupkg
This should resolve issues running RProvider.Server.exe when only Visual
Studio 2013 is installed.
Merge pull request #102 from dcharbon/issue95

Add FSharp.Core dll, optdata, and sigdata to nupkg
Specify target framework in NuGet package
This is done by convention, so assemblies are now placed in lib/net40. The
RProvider.Runtime.dll.config ProbingLocations property needed to be
updated so that the relative path is correct.
Merge pull request #103 from dcharbon/specifyTargetFramework

Specify target framework in NuGet package
Automatically tag versions, fix load script, tweak docs
Merge changes in load script
Update release notes
Add failing printing test
Fix for #106
Merge pull request #105 from tpetricek/master

Add failing printing test
Merge pull request #107 from jmp75/master

Fix issue #106 - character device interceptor passed to REngine.GetInstance
Define RemoteSession for Remote R access

RemoteSession provides a way to create a connection to a remote R
process via the svSocket package for R. Some functions in RInterop are
generalized to allow as much reuse as possible for functions that
perform the same behavior whether local or remote.
Add RemoteR type provider

The RemoteR type provider provides a way to import and export data
between F# and R sessions, as well as make remote calls to a running R
session.
Launch local RGui from fsi for a RemoteSession

Enable launch of RGui from fsi. Ensure that svSocket is installed and
launch the socket server.
Better connection error handling

When the R svSocket server isn't running produce a better error message.
Also, set a default timeout so that the type provider doesn't hang
waiting for the R svSocket server if it isn't running.
Fix merge errors from rebasing on master.