Use github repo until artifacts are uploaded to the FRC server

Author: SamCarlberg

src/main/java/edu/wpi/first/wpilib/opencv/installer/Installer.java

@@ -26,6 +26,7 @@ public class Installer {
 
     private static final String userHome = System.getProperty("user.home");
     private static final String wpilibUrl = "http://first.wpi.edu/FRC/roborio/maven";
+    private static final String githubRepo = "https://github.com/SamCarlberg/opencv-maven/raw/mvn-repo";
     private static final String mavenLocal = userHome + "/.m2/repository";
     private static final Path tmpDir;
     private static final Path unzippedDir;
@@ -209,7 +210,7 @@ private static void install(ArtifactType type) {
             File local = resolveLocal(artifactId, v);
             File source;
             if (!local.exists()) {
-                copyToMavenLocal(wpilibUrl, groupId, artifactId, v);
+                copyToMavenLocal(githubRepo, groupId, artifactId, v);
             }
             if (local.exists()) {
                 System.out.println("Using local file at " + local.toURI());
@@ -236,7 +237,7 @@ private static void install(ArtifactType type) {
     }
 
     private static URL resolveRemote(String artifactId, String version) throws MalformedURLException {
-        return new URL(resolveRelative(wpilibUrl, artifactId, version));
+        return new URL(resolveRelative(githubRepo, artifactId, version));
     }
 
     private static File resolveLocal(String artifactId, String version) {
@@ -320,6 +321,9 @@ private static Path copyToMavenLocal(String repo, String groupId, String artifac
         String remoteDir = String.format("%s/%s/%s/%s/", repo, groupId.replace('.', '/'), artifactId, version);
         String name = String.format("%s-%s", artifactId, version);
         String dstDir = remoteDir.replace(repo, mavenLocal);
+        if (!Files.exists(Paths.get(dstDir))) {
+            Files.createDirectories(Paths.get(dstDir));
+        }
 
         String jar = name + ".jar";
         String jarPath = remoteDir + jar;