Temporarily reset &modified when opening files

:edit and similar commands used by the --remote* options throw an exception if
the buffer is modified:

    E37: No write since last change (add ! to override)

Using :enew! doesn't work, since it reverts all changes. Thus we simply reset
&modified temporarily.

References https://github.com/mhinz/neovim-remote/issues/54

nvr/nvr.py

@@ -100,6 +100,10 @@ class Neovim():
         if not self.is_attached(silent):
             return
 
+        modified = self.server.current.buffer.options['modified']
+        if modified:
+            self.server.current.buffer.options['modified'] = False
+
         cmds, files = split_cmds_from_files(arguments)
 
         for fname in files:
@@ -126,6 +130,9 @@ class Neovim():
         for cmd in cmds:
             self.server.command(cmd if cmd else '$')
 
+        if modified:
+            self.server.current.buffer.options['modified'] = True
+
         return len(files)
 
     def _show_msg(self, old_address):

setup.py

@@ -18,7 +18,7 @@ setup(
         'console_scripts': ['nvr = nvr.nvr:main']
     },
     packages         = ['nvr'],
-    version          = '1.8.0',
+    version          = '1.8.1',
     license          = 'MIT',
     keywords         = 'neovim nvim nvr remote helper',
     classifiers      = [