Single binary executables (#1330)

* Single binary executables / DEB packages.

* Attach single binary executables to the releases

extras/packaging/linux/scripts/httpie_cli.py

@@ -0,0 +1,5 @@
+from httpie.manager.__main__ import main
+
+if __name__ == '__main__':
+    import sys
+    sys.exit(main())