Added layouts directory to avoid error when generating site

Hugo ouputs an error like:

ERROR: 2014/11/19 Walker:  lstat /path/to/HugoBasicExample/layouts: no such file or directory

when testing a new theme against this repo, unless the layouts folder is created first

Tested with hugo built from commit master (on commit 728d0fa32cb666264045783518cc6ded5c78f246)
Tweaked git ignore to exclude the generated public folder