Add id of current menu_link to field names.

Fixes a bug which prevented attributes on any item other than the
first being updated, as form field names were being output as:

page_menu[links_attributes][title_attribute]
rather than
page_menu[links_attributes][1][title_attribute]
removed DS_Store
removed bullet
added html attributes for menu links
changed gitignore to just ignore the bin dir
updated menu_branch partial to fix bug
updated test for html attributes
Merge pull request #22 from skipchris/fix_bug

Add id of current menu_link to field names. Also fixes #19.
fixed travis url
Avoid duplicating menus.
Merge pull request #23 from initforthe/bug/seeds

Fix duplication in seed file
Update readme.md
updated readme with correct issues path
Merge.