update firmware, typos fixed

Update two typo bugs:

```
Jun 02 07:24:14 overo [871]: sync failed
                             Traceback (most recent call last):
                               File "/usr/lib/python2.7/site-packages/dataplicity-0.1.4_dev-py2.7.egg/dataplicity/app/subcommands/daemon.py", line 154, in sync_now
                                 self.client.sync()
                               File "/usr/lib/python2.7/site-packages/dataplicity-0.1.4_dev-py2.7.egg/dataplicity/client/client.py", line 192, in sync
                                 self._sync()
                               File "/usr/lib/python2.7/site-packages/dataplicity-0.1.4_dev-py2.7.egg/dataplicity/client/client.py", line 348, in _sync
                                 install_path = firmware.install_encoded(device_class, version, firmware_b64)
                               File "/usr/lib/python2.7/site-packages/dataplicity-0.1.4_dev-py2.7.egg/dataplicity/firmware.py", line 127, in install_encoded
                                 activate(device_class, version, dst_fs)
                             TypeError: 'bool' object is not callable
```
-------------------

```
Jun 02 08:01:19 overo [3851]: sync failed
                              Traceback (most recent call last):
                                File "/usr/lib/python2.7/site-packages/dataplicity-0.1.4_dev-py2.7.egg/dataplicity/app/subcommands/daemon.py", line 154, in sync_now
                                  self.client.sync()
                                File "/usr/lib/python2.7/site-packages/dataplicity-0.1.4_dev-py2.7.egg/dataplicity/client/client.py", line 192, in sync
                                  self._sync()
                                File "/usr/lib/python2.7/site-packages/dataplicity-0.1.4_dev-py2.7.egg/dataplicity/client/client.py", line 350, in _sync
                                  self.log('firmware installed in "{}"'.format(install_path))
                              TypeError: 'Logger' object is not callable
```