add storage flag for location/session switch

This changed default storage location to sessionStorage. config can be used to specify locationStorage if needed.
<a href='#crh-start'></a><a href='#crh-data-%7B%22processed%22%3A%20%5B%22https%3A//github.com/AzureAD/azure-activedirectory-library-for-js/pull/59%23discussion_r22143167%22%5D%2C%20%22comments%22%3A%20%7B%22Pull%20bb2dbcff072680c2b54bd935e6e99c3d4f1a9b93%20bower.json%204%22%3A%20%7B%22html_url%22%3A%20%22https%3A//github.com/AzureAD/azure-activedirectory-library-for-js/pull/59%23discussion_r22143167%22%2C%20%22comments%22%3A%20%5B%7B%22body%22%3A%20%22where%20is%200.0.4%3F%22%2C%20%22created_at%22%3A%20%222014-12-20T18%3A25%3A27Z%22%2C%20%22user%22%3A%20%7B%22avatar_url%22%3A%20%22https%3A//avatars.githubusercontent.com/u/5713915%3Fv%3D3%22%2C%20%22html_url%22%3A%20%22https%3A//github.com/kpanwar%22%7D%7D%5D%2C%20%22title%22%3A%20%22File%3A%20bower.json%3AL1-7%22%7D%7D%7D'></a>
<a href='https://www.codereviewhub.com/'><img src='http://www.codereviewhub.com/site/github-bar.png' height=40></a>
- [ ] <a href='#crh-comment-Pull bb2dbcff072680c2b54bd935e6e99c3d4f1a9b93 bower.json 4'></a> <img src='http://www.codereviewhub.com/site/github-remaining.png' height=16 width=60>&nbsp;<b><a href='https://github.com/AzureAD/azure-activedirectory-library-for-js/pull/59#discussion_r22143167'>File: bower.json:L1-7</a></b>
- <a href='https://github.com/kpanwar'><img border=0 src='https://avatars.githubusercontent.com/u/5713915?v=3' height=16 width=16'></a> where is 0.0.4?


<a href='https://www.codereviewhub.com/AzureAD/azure-activedirectory-library-for-js/pull/59?mark_as_completed=1'><img src='http://www.codereviewhub.com/site/github-mark-as-completed.png' height=26></a>&nbsp;<a href='https://www.codereviewhub.com/AzureAD/azure-activedirectory-library-for-js/pull/59?approve=1'><img src='http://www.codereviewhub.com/site/github-approve.png' height=26></a>&nbsp;<a href='https://github.com/AzureAD/azure-activedirectory-library-for-js/pull/59'><img src='http://www.codereviewhub.com/site/github-refresh.png' height=26></a>
<a href='#crh-end'></a>