Added quotes around commands using raw paths

This fixes issues with spaces in path names.
diff --git a/devlib/utils/android.py b/devlib/utils/android.py
index cbbfd09..eeb05ee 100644
--- a/devlib/utils/android.py
+++ b/devlib/utils/android.py
@@ -167,7 +167,7 @@
     def push(self, source, dest, timeout=None):
         if timeout is None:
             timeout = self.timeout
-        command = 'push {} {}'.format(source, dest)
+        command = "push '{}' '{}'".format(source, dest)
         return adb_command(self.device, command, timeout=timeout)
 
     def pull(self, source, dest, timeout=None):
@@ -179,10 +179,10 @@
             command = 'shell ls {}'.format(source)
             output = adb_command(self.device, command, timeout=timeout)
             for line in output.splitlines():
-                command = 'pull {} {}'.format(line, dest)
+                command = "pull '{}' '{}'".format(line, dest)
                 adb_command(self.device, command, timeout=timeout)
             return
-        command = 'pull {} {}'.format(source, dest)
+        command = "pull '{}' '{}'".format(source, dest)
         return adb_command(self.device, command, timeout=timeout)
 
     def execute(self, command, timeout=None, check_exit_code=False, as_root=False):