Merge pull request #19 from CleoQc/master

Doing a chmod here could lead to endless loops if permissions are wrong

Author: CleoQc

I2C_mutex.py

@@ -29,7 +29,6 @@ def acquire(self):
         while not acquired:
             try:
                 self.DexterLockI2C_handle = open(self.DexterLockI2C_handle_filename, 'w')
-                os.chmod(self.DexterLockI2C_handle_filename, 0o777)
                 # lock
                 fcntl.lockf(self.DexterLockI2C_handle, fcntl.LOCK_EX | fcntl.LOCK_NB)
                 acquired = True