Sets MACOSX_DEPLOYMENT_TARGET variable to avoid trivial incompatibility with OSX version earlier than the one used to build DUB

The default compiler should not depend on DUB's own build environment

use DMD to refer to dmd/gdmd/ldmd2 ...

- and keep DC for dmd/gdc/ldc2

don't build with debug and debug info ...

- fixes linking with ldc

fix build.sh for LDC

Use the actual binary name used to build DUB as the default compiler. See #303.

Add a DUB configuration to compile as a library without curl support.

Fix typo.

Fix build.sh for non-Linux systems.

Force the static version of Phobos for DMD/Posix.

Remove -property flag from build scripts.

Module statement addded to autogenerated version_.d

Fix Posix build script.

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

Add build workaround also for LDC.

Attempt to replace the Ubuntu fix by a more generic fix that does not depend on a distribution name. See also #71.

Silence lsb_release output.

Syntax error fix.

Redo build script to directly call the compiler + limited compiler auto-detection. ...

No rdmd is necessary anymore and the call to "uname -a" has been changed to
"lsb_release -i" to detect the distribution more reliably. This needs to be
properly fixed, though, by looking at the GCC version or by using a
workaround that works on older _and_ newer versions.

Don't print build success after build errors.

Improve wording of the post-build message.

Fix the build script for non-Ubuntu systems.

dub will be build into the bin directory, so that when the dub executable's location is added to the path, the build.cmd / build.sh is not made globally accesible.

Add workaround to enable compilation on Ubuntu.

Add -w -property to the build scripts and fix the build appropriately.

Using pkg-config if available to build on Posix.

Added support for building on Linux.