use d-test-utils & bump libdparse to 0.15.x

Because this release fixes the private protection issue through new
dsymbol (since 0.11.0) we also need to bump libdparse to at least 0.15.0
so no older libdparse versions are supported.

.gitmodules

@@ -14,3 +14,6 @@
 [submodule "stdx-allocator"]
 	path = stdx-allocator
 	url = https://github.com/dlang-community/stdx-allocator
+[submodule "d-test-utils"]
+	path = d-test-utils
+	url = https://github.com/dlang-community/d-test-utils.git

.travis.sh

@@ -3,8 +3,16 @@
 set -e
 
 if [[ $BUILD == dub ]]; then
-    dub build --build=release --config=client
-    dub build --build=release --config=server
+    if [[ -n $LIBDPARSE_VERSION ]]; then
+        rdmd ./d-test-utils/test_with_package.d $LIBDPARSE_VERSION libdparse -- dub build --build=release --config=client
+        rdmd ./d-test-utils/test_with_package.d $LIBDPARSE_VERSION libdparse -- dub build --build=release --config=server
+    elif [[ -n $DSYMBOL_VERSION ]]; then
+        rdmd ./d-test-utils/test_with_package.d $DSYMBOL_VERSION dsymbol -- dub build --build=release --config=client
+        rdmd ./d-test-utils/test_with_package.d $DSYMBOL_VERSION dsymbol -- dub build --build=release --config=server
+    else
+        echo 'Cannot run test without LIBDPARSE_VERSION nor DSYMBOL_VERSION environment variable'
+        exit 1
+    fi
 elif [[ $DC == ldc2 ]]; then
     git submodule update --init --recursive
     make ldc -j2

.travis.yml

@@ -13,7 +13,10 @@ os:
 
 env:
   - BUILD=
-  - BUILD=dub
+  - BUILD=dub LIBDPARSE_VERSION=min
+  - BUILD=dub LIBDPARSE_VERSION=max
+  - BUILD=dub DSYMBOL_VERSION=min
+  - BUILD=dub DSYMBOL_VERSION=max
 
 branches:
   only:

d-test-utils

@@ -0,0 +1 @@
+Subproject commit 206a2e6abd97b4462f3a320e4f2d23986fad3cff

dsymbol

@@ -1 +1 @@
-Subproject commit f4a481cdc23b58ce544c2e91a39d5c0d406b67ac
+Subproject commit 71168a8449958e1807a8ba22c8a4df15456bae83

dub.json

@@ -7,8 +7,8 @@
   ],
   "license": "GPL-3.0",
   "dependencies": {
-    "dsymbol": "~>0.9.0",
-    "libdparse": "~>0.13.0",
+    "dsymbol": ">=0.11.0 <0.12.0",
+    "libdparse": ">=0.15.0 <0.16.0",
     ":common": "*",
     "stdx-allocator": "~>2.77.5",
     "emsi_containers": "~>0.8.0-alpha.15"

libdparse

@@ -1 +1 @@
-Subproject commit 5270739bcd1962418784c7760773e24d28b6009b
+Subproject commit f9a82848fe98a84f38a66df950514c3556e7fb2d