Query git to determine the current DUB version and report it on the help screen. Fixes #39.

Add support for DUBPATH and "add-path" + change the default installation location to the DUB user path. Fixes #64. ...

This change allows to specify a number of directories in addition to the system and user DUB package directories to search for local packages.

Full list of changes:

 - Add support for the DUBPATH environment variable (a (semi-)colon separated list of paths)
 - Add support for "dub add-path" and "dub remove-path" to add static search paths
 - The branch of local packages with no "version" field in their package.json is now inferred using "git rev-parse"
 - The structure of the user/system package directories is changed from "packages/<packname>/<packver>" to "packages/<packname>-<packver>"
 - There is no project local package directory (".dub/packages") anymore - packages are instead installed to the user package directory by default
 - Upgrading and uninstallation is partially broken in this commit - will be fixed later

Implement a first version of "dub describe".

Added "dub list-system" and "dub list-user".

Remove the thread/fiber IDs to clean up the console output visually. ...

DUB is single threaded/fibered anyway, so no need to log them.

Move all source files outside of "dub" to "dub/internal".

Added coverage analysis build types. Fixes #45.

Prepare for multiple registry support, update stdx.process and make env vars available to custom commands. ...

See also #22.

Removed spurious loading of a package in the CWD. Fixes #25.

Update app.d

Implemented pre/post commands and --build=ddox + support "sourceFiles". ...

Other fixes:
 - fixed class Dub to work with other path than cwd
 - "files" has been deprecated in favor of "sourceFiles"
 - --build=docs also works now
 - Changed the way build flags are parsed (instead of checking every possible field for existence, all fields are iterated and their name is matched)

Displaying help for a command.

Reverted adding the dependency, when "dub install pkg" is called. Creating a dependency should not be done through install. Has impact on #12. ...

Additionally added the uninstall feature.

Fixed the "Checking dependencies" path to use native path format.

Compile fix.

When the user calls install from the command line, a dependency will be added to the project's package.json. However, this will reformat that file. Should now perform more like user expectations mentioned in #12.

Fixed naming convention for enum InstallLocation and avoid reinstalling packages that are already up to date.

Fixed "dub upgrade" when a package is stalled user or system wide.

Renamed all the "vibe" package to "vibecompat" to avoid conflicts.

Removed the vibe.d dependency by dragging in a minimal set of interfaces of vibe.d ...

The interfaces are reimplemented using standard Phobos functionality. Calls to
these interfaces will be gradually replaced by direct Phobos calls.

Added rudimentary support for the --arch= option and moved build type flag generation to a common place.

Mention the default command in the help screen.

Avoid use of deprecated functions + fixed package installation.

By default, the compiler is not invoked directly (can be overridden using --rdmd).

Fixed up the VisualD and Mono-D generators and changed their names on the command line to lower-case.

Added a new "build" generator that directly invokes the compiler. ...

This generator supports all compilers in contrast to the rdmd based one and will later be the default.

Moved empty package creation from app.d to the Dub class.

Changed the initial project source code (dub init) to not depend on vibe.d.

"dub build" and "dub run" are now also executed using the generator system (RdmdGenerator).

Also added support for gdmd and ldmd