Description of problem:
Calling `ino init', does not create lib/ in the project directory.  This causes `ino build' to fail later.

Version-Release number of selected component (if applicable):
ino-0.3.5-1.fc18.noarch (and probably newer versions too)

How reproducible:
Always

Steps to Reproduce:
1. mkdir /tmp/test && cd /tmp/test
2. ino init && tree
   └── src
       └── sketch.ino
3. ino build
   ...
   Detecting Arduino software version ...  1.0 (1.0.5)
   Traceback (most recent call last):
     File "/usr/bin/ino", line 6, in <module>
       main()
     File "/usr/lib/python2.7/site-packages/ino/runner.py", line 63, in main
       args.func(args)
     File "/usr/lib/python2.7/site-packages/ino/commands/build.py", line 209, in run
       self.scan_dependencies()
     File "/usr/lib/python2.7/site-packages/ino/commands/build.py", line 171, in scan_dependencies
       lib_dirs = [self.e.arduino_core_dir] + list_subdirs(self.e.lib_dir) + list_subdirs(self.e.arduino_libraries_dir)
     File "/usr/lib/python2.7/site-packages/ino/utils.py", line 41, in list_subdirs
       entries = [e for e in os.listdir(dirname) if e not in exclude and not e.startswith('.')]
   OSError: [Errno 2] No such file or directory: 'lib'

Actual results:
Shown next to the appropriate steps above.

Expected results:
after step (3)
...
Linking libarduino.a
Linking firmware.elf
Converting to firmware.hex

Additional info:
For now I do a `mkdir lib' after `ino init'.