use DC instead of COMPILER ...

- so it's clear that it can be dmd/ldc2/gdc

don't abort test on first failure ...

- makes it easier to find all errors at once

mktemp on OSX requires a template

fix #674 - cache needs to be locked for concurrent dub runs ...

- implement lockFile/tryLockFile using mkdir
- use lockFile to synchronize package download

Merge pull request #663 from MartinNowak/feat663 ...

A feature like `cargo search`

implement search command ...

- queries all package suppliers and outputs any found package

Merge branch '0.9.24'

Merge pull request #633 from Abscissa/fix616 ...

Fix #616: Infinite new-process recursion using dub decribe within…

Fix permissions.

Rename and fix test.

Add test case for #346.

Fix #624: --data=libs should output in compiler-format, not linker format.

Add test case for packages with package.json. See #639.

Hopefully fix for ldc/gdc.

Missed a couple changes in last commit.

Fix #616: Infinite new-process recursion using dub decribe within preGenerateCommands

Partially fix shared library build for LDC and skip tests for LDC/GDC. ...

Both compilers are not yet ready for shared library builds out of the box.

Fix building dynamic libraries. Fixes #613.

Make the dependency test packages compile on Windows.

Add SDL support to "dub init". ...

SDL is now the default format and "-f json" can be used to force JSON.

Fixed: --data=linker-files misses linker files specified in dub.json.

Change order of describe-data tests, list should run before dmd as it's easier to debug.

Again, rework --data's handling of sourceFiles and static library dependencies.

Skip DMD-centric tests when DMD isn't available.

Rework --data's handling of sourceFiles and static library dependencies.

Allow comma-separated list in --data, for brevity.

Add --data-0 to output --data= info null-delimited for (ex.) xargs -0

Replace --data-format with --compiler and --data-list.

Add 'dub describe --data-format=' to format the output of --data= directly for a compiler's commandline. Use --data-format=list to get the old list-style output.

Split --data=libs into two: --data=libs (for installed/system libs) and --data=lib-files (for dependency libs) ...

This is needed because compilers/linkers often expect the two types of libs to be passed in differently: System/installed libs (--data=libs) must be provided like "-Lname" which the linker automatically converts to "path/lib*.a". Non-installed libs, such as dub dependencies, are passed with full filepath just like an object file. Your linker may vary.