Beta 2.104.0

[Iain Buclaw]

Glad to announce the first beta for the 2.104.0 release, ♥ to the 
36 contributors.

This release comes with 11 major changes, including:

- In the compiler, User Defined Attributes now parse template 
arguments.
- In the standard library, `std.typecons.Rebindable` now supports 
all types
- In dub, new properties `cSourcePaths` and `cImportPaths` have 
been added to pass C sources and add additional search paths for 
C headers to the compiler.

http://dlang.org/download.html#dmd_beta
http://dlang.org/changelog/2.104.0.html

As usual please report any bugs at
https://issues.dlang.org

-Iain
on behalf of the Dlang Core Team