Add "-d" option for "--project-dir" to init & run commands

docs/userguide/cmd_run.rst

@@ -51,10 +51,10 @@ Upload port of embedded board. To print all available ports use
 :ref:`cmd_serialports` command
 
 .. option::
-    --build-dir
+    -d, --project-dir
 
-Specify the path to project directory. By default, ``--build-dir`` is equal to
-current working directory (``CWD``).
+Specify the path to project directory. By default, ``--project-dir`` is equal
+to current working directory (``CWD``).
 
 .. option::
     -v, --verbose

platformio/commands/run.py

@@ -22,7 +22,7 @@ from platformio.platforms.base import PlatformFactory
 @click.option("--environment", "-e", multiple=True, metavar="<environment>")
 @click.option("--target", "-t", multiple=True, metavar="<target>")
 @click.option("--upload-port", metavar="<upload port>")
-@click.option("--project-dir", default=getcwd,
+@click.option("--project-dir", "-d", default=getcwd,
               type=click.Path(exists=True, file_okay=False, dir_okay=True,
                               writable=True, resolve_path=True))
 @click.option("--verbose", "-v", count=True, default=3)