Avoid assertion when building path based sub packages (or packages with path based dependencies).

Avoid downloading base package for non-existent sub package references, if possible. ...

When it can be proven that a certain sub package doesn't exist (this is the case when the base package descriptions doesn't contain any path based dependencies), the dependency will be skipped as invalid instead of downloading the whole package to search for the sub package there.

Avoid downloading base packages if possible. Fixes #345. ...

Before manually extracting a sub package from a base package, the package description of the base package is first searched for the sub package. This avoids the otherwise necessary download of the base package whenever the sub package is a non-path-based one. This also opens the way for the dub registry to always collect all sub packages into the reported package description, so that it will never be necessary to actually download a package for getting a sub package.

Fix detection of root package references during dependency resolution. See #334. ...

- References to and from sub packages of the root package are now also recognized as coming from the root package
 - Any dependency reference within a certain package "family"* (including path based ones) is now mapped to the same base package (circumventing the lookup of all possible matches)

* "family" == base package and all of its sub packages

Avoid redundant loading of packages and remove PackageManager.getTemporaryPackage.

Removed extra spaces between words

Use "dub.json" instead of "package.json" in documentation

Various improvements. Fixes #268. ...

- Treat all package paths as ending with a slash to fix path comparison issues
 - Avoid re-reading all packages twice when building, see also #325.
 - Fix bogus "License in subpackage different" warning

Removed 'Wide' from PlacementLocation member names.

Merge branch 'upstreammaster' ...

Conflicts:
	source/dub/project.d

Improve the error message when removing a package is ambiguous. ...

See also http://forum.rejectedsoftware.com/groups/rejectedsoftware.dub/thread/1437/

Switched fetch command to use defaultPlacementLocation.

Added support for fetching to any location, now need to add support for finding packages in other locations.

Implement a basic "clean" command. Fixes #134.

*Rally* only overwrite dub.selections.json if necessary.

Only overwrite dub.selections.json if there are actual changes.

Handle invalid version selections gracefully. ...

When a selected version of a package doesn't exist anymore (locally any in the registry) for some reason, DUB now falls back to the best match automatically.

Switched dub.fetch() to take an enum FetchOptions instead of 4 bools.

Fix path based dependencies. See #282 and #253.

Fix usage of the selections file (was completely ignored) and improve diagnostic output.

Avoid querying the package registries repeatedly for invalid packages.

Fix null pointer dereference in DependencyVersionResolver when no project is loaded.

Use URL and Path types of vibe.d if available for better interop.

Rename UpdateOptions->UpgradeOptions and move it to dub.dub.

Properly support path based version selections.

Make DependencyVersionResolver public for external use.

block on ddox child process ...

- fixes SIGINT (ctrl+c) for 'dub -b ddox'

Resolve sub packages of the root package directly instead of using the package manager. Fixes #287.

Handle packages with invalid package descriptions gracefully and improve diagnostic output.

Fix path based dependencies to be ignored for version selections.