Added singleFile support

Add a --temp-build switch to force building in the TEMP folder. Fixes #294.

Only add platform flags for targets that generate an actual binary. Fixes #346.

Removed trailing whitespace

Add the --build-mode switch to control how the compiler and linker are invoked.

Process variables for pre-/postGenerateCommands.

Fix copying "copyFiles".

Run executables _after_ generation has finished. ...

In particular, the generated application is run after the copyFiles have been placed. This is a fix for a regression that was introduced after the last release version.

Collect build targets after running preGenerateCommands. Fixes #144. ...

This enables used generated source files without listing each of them manually. Now a single "sourcePaths" entry is sufficient.

Rename Project.mainPackage to rootPackage. ...

Root package better describes the package's role of the root of the dependency hierarchy.

correct imports

Merge branch 'dustmite'

Silence debugging log message

Don't downward inherit Have_* versions and only partially string import paths. ...

This change allows library builds to be reused for multiple dependees in most situations. String import paths are now only downwards inherited for packages that already have string import paths defined.

Only insert packages belonging to the same target into TargetInfo.packages.

Add support for execution result callbacks in the build generator.

Fix handling of targetType none packages and automatically treat packages with no source files as targetType none.

Emit proper error message when trying to build a sourceLibrary.

Fix the link order of dependencies (working for --as-needed).

Fix folder/filter structure for generated VisualD projects with multiple nested source libraries.

Deprecate the "visuald-combined" generator.

Reimplement the VisualD generator based on the new target generation code and fix link dependencies for static libraries.

Apply the platform specific build settings to all targets. Fixes #201. Fixes #204.

Remove log noise.

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

Fix computation of build settings necessary for linking to library dependencies.

Implement individual building of dependencies.

Add --force switch for "dub run" and "dub build" and fix --rdmd.

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.