does not handle lines broken with "\" well

I get parse errors on python code with lines broken with a backslash character like:
```python
assert True, \
"This is valid python, right?"
```

It gives output:
```python
Parsing of file failed: valid.py
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/pycycle/utils.py", line 70, in read_project
tree = ast.parse('\n'.join(lines))
File "/usr/lib/python2.7/ast.py", line 37, in parse
return compile(source, filename, mode, PyCF_ONLY_AST)
File "", line 2

^
SyntaxError: invalid syntax
```

#### Expected:
Also python code with backslash ending lines is parsed correctly.

Start at pycycle/utils.py line 70, in read_project, where the joined source is passed to ast.parse. Reproduce the issue with the provided Python snippet and trace how backslash-continued lines are read; done means that example parses without the reported SyntaxError.

Written by the indexing model from the issue text.