Builds: added elixirc and mix compile.

Author: azizk

builds/Elixir - elixirc $file.sublime-build

@@ -0,0 +1,8 @@
+{
+  "cmd": ["elixirc", "$file"],
+  "selector": "source.elixir",
+  "windows": {
+    "working_dir": "$file_path",
+    "cmd": ["elixirc.bat", "$file_name"]
+  }
+}

builds/Elixir - mix compile.sublime-build

@@ -0,0 +1,17 @@
+{
+  "cmd": ["mix", "compile"],
+  "working_dir": "${project_path:${folder}}",
+  "selector": "source.elixir",
+  "windows": {
+    "cmd": ["mix.bat", "compile"]
+  },
+  "variants": [
+    {
+      "name": "Dependencies",
+      "cmd": ["mix", "deps.compile"],
+      "windows": {
+        "cmd": ["mix.bat", "deps.compile"]
+      }
+    }
+  ]
+}