Check and fix bugs in command line Frontend GUI

[Lyubava]

1. Fix paths to correct work of Frontend on developer's Veles version

lpodoynitsina@lpodoynitsinau64:~/Projects/Veles$ python3 -m veles --frontend

Processing arguments...
Writing /export/home/lpodoynitsina/Projects/Veles/web/dist/frontend.html...
Process Process-1:
Traceback (most recent call last):
File "/usr/lib/python3.4/multiprocessing/process.py", line 254, in _bootstrap
self.run()
File "/usr/lib/python3.4/multiprocessing/process.py", line 93, in run
self._target(_self._args, *_self._kwargs)
File "/export/home/lpodoynitsina/Projects/Veles/veles/main.py", line 282, in _open_frontend_process
main()
File "/export/home/lpodoynitsina/Projects/Veles/veles/scripts/generate_frontend.py", line 83, in main
sout = loader.load("frontend.html").generate(
File "/usr/local/lib/python3.4/dist-packages/tornado/template.py", line 343, in load
self.templates[name] = self._create_template(name)
File "/usr/local/lib/python3.4/dist-packages/tornado/template.py", line 370, in _create_template
with open(path, "rb") as f:
FileNotFoundError: [Errno 2] No such file or directory: '/export/home/lpodoynitsina/Projects/Veles/web/dist/templates/frontend.html'