Add option to use NVIDIA Nsight Compute CLI profiler (#21)

* Use NVIDIA Nsight Compute CLI profiler

* Add profile and profiler-args options to argument parser.

* Add missing comma to profiler-args option.

* Use profile args in version 1 of the plugin

* Change profiler-args option to take all remaining arguments

* Change profiler_args type from string to list of strings

* Add profile option to version 2 of the plugin

* Add profiler usage instructions

common/helper.py

@@ -3,8 +3,27 @@ import argparse
 
 def get_argparser():
     parser = argparse.ArgumentParser(description='NVCCPlugin params')
-    parser.add_argument("-t", "--timeit", action='store_true',
-                        help='flag to return timeit result instead of stdout')
+    parser.add_argument(
+        '-t', 
+        '--timeit',
+        action='store_true',
+        help='If set, returns the output of the "timeit" built-in ipython magic instead of stdout.',
+    )
+    parser.add_argument(
+        '-p', 
+        '--profile', 
+        action='store_true',
+        help='If set, runs the nvidia nsight compute profiler. Has no effect if used with --timeit.',
+    )
+    parser.add_argument(
+        '-a',
+        '--profiler-args',
+        type=str,
+        nargs=argparse.REMAINDER,
+        default=[],
+        help='Extra options that can be passed to the nvidia nsight compute profiler. '
+             'Must be the last option given to the argument parser so you can pass arguments with dashes.',
+    )
     return parser