Print the version of each target during the build.
Fix suggestion text for -debug= dflags. See #310.
Improve the error message when removing a package is ambiguous.

See also http://forum.rejectedsoftware.com/groups/rejectedsoftware.dub/thread/1437/
Add spellchecker to dub for --config mismatches.
Merge pull request #313 from AndrejMitrovic/SpellCheck

Add spellchecker to dub for --config mismatches.
Process variables for pre-/postGenerateCommands.
Don't run postBuildCommands for up to date targets.
Implement support for $ROOT_PACKAGE_DIR and $<PACK_NAME>_PACKAGE_DIR variables. Fixes #260.

PACK_NAME must be all uppercase and dashes (-) must be replaced by underscores (_).
Merge branch 'upstreammaster'

Conflicts:
	source/dub/project.d