Move DependencyResolver to its own module and reorder Version<->Dependency.

Fix build settings used for dependencies that are referenced multiple times and remove the Mono-D generator.

Add a module for handling SemVer version strings - will replace the Version struct in the future.

Move command line processing to a separate module.

Integrate the rdmd generator into the build generator and start to implement build caching. ...

The basic directory structure, as outlined in https://github.com/rejectedsoftware/dub/wiki/Separate-compilation-and-caching-of-dependencies has been implemented.

Still missing:

 - Dependencies are not built separately
 - The hash part of the build directory is not taking into account any build properties right now

Remove dub.internal.std.process compatibility code as it doesn't support browse() and the compile status on older DMD versions isn't tracked anyway.

Extend "dub init" to take an optional type argument and don't create "public"/"views" folders by default. Fixes #152. ...

The generated package.json is also improved WRT the copyright and author strings (using the current date and the local user name).

Move dub.utils to dub.internal.utils and update copyright dates.

Remove installation.d from build-files.txt.

Fix build script for missing registry.d file. Fixes #95.

Preparing for the new std.process in Phobos.

Changed the windows build script to directly call the compiler instead of rdmd. ...

The compiler used can be customized by setting the DC environment variable ("dmd" is the default and "gdmd" or "ldmd" are the most likely alternatives).