Merge branch 'master' of github.com:rejectedsoftware/dub

uninstalling locally installed packages may be done by the user

Disable automatic upgrade of packages as it is currently broken. ...

This only ever worked for project locally installed packages, which are not supported anymore.

Add some basic example projects.

Avoid reloading local packages multiple times during a single run.

fixed uninstallation

Merge branch 'master' of github.com:rejectedsoftware/dub

using size_t to compare parts of the version string

Compiler and linker flags are not added in a unique way anymore. ...

This was breaking command lines such as "--framework A --framework B" on Mac OS.

Made "dependencies" a per-configuration setting instead of a purely global setting.

Merge branch 'master' of github.com:rejectedsoftware/dub

dub's Version are now based upon Semantic Verioning 2.0.0-rc.2.

Merge branch 'master' of github.com:rejectedsoftware/dub

Avoid calling pkg-config with no libs present.

When conflicting dependencies where current in a project and its dependencies, dub could get into an infinite update loop. ...

This was because one package to be used was added to the graph, which then spawned a missing package for another dependency, because of not matching versions. These versions could then toggle forth and back.
This is now solved by aborting the dependency graph resolving process when conflicts are found. As the dependencies are resolved from the outermost to the innermost, this will propably hide some deeper conflicts, but then again show more user relevant conflicts first.
This does not resolve the question on what to do when merging ">=0.13.4" with "~master". But this can be resolved later on.
Fixes #72.

Do not enforce the components to be valid, when constructing a Depenency object from another. The Dependency will then return valid() = false, which is in fact a valid state of the object.

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

Fix dangling else warning.

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

Add exception messages.

Compile fix for -inline compilation.

Add unit tests to the path module and make \\UNC\ paths absolute.

Remove all unit tests from the processcompat module as many of them failed (not an issue since the new std.process is now in DMD 2.063).

Deprecate "relaxProperties", remove the default -property switch and warn about using them. Fixes #73.

Fix warnings for latest DMD beta.

fixes support for unc path

fixes unc path error

Fix object directory for -op switch in the VisualD generator and prepare for different project file directories. ...

Future versions may choose to put the project files in the .dub directory (the solution file will still stay in the project's root directory).

Change the file dictionary to a file list for "dub describe"'s output.

Implement a first version of "dub describe".