Logging fix

<a href='#crh-start'></a><a href='#crh-data-%7B%22processed%22%3A%20%5B%22https%3A//github.com/AzureAD/azure-activedirectory-library-for-objc/pull/230%23discussion_r21482065%22%5D%2C%20%22comments%22%3A%20%7B%22Pull%2084f699f9c6e15d02113ad51635592ba2b2f765b2%20ADALiOS/ADALiOS/ADLogger.m%2043%22%3A%20%7B%22html_url%22%3A%20%22https%3A//github.com/AzureAD/azure-activedirectory-library-for-objc/pull/230%23discussion_r21482065%22%2C%20%22comments%22%3A%20%5B%7B%22body%22%3A%20%22does%20it%20log%20as%20utc%20date%3F%22%2C%20%22created_at%22%3A%20%222014-12-08T20%3A23%3A35Z%22%2C%20%22user%22%3A%20%7B%22avatar_url%22%3A%20%22https%3A//avatars.githubusercontent.com/u/466805%3Fv%3D3%22%2C%20%22html_url%22%3A%20%22https%3A//github.com/omercs%22%7D%7D%5D%2C%20%22title%22%3A%20%22File%3A%20ADALiOS/ADALiOS/ADLogger.m%3AL112-121%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 84f699f9c6e15d02113ad51635592ba2b2f765b2 ADALiOS/ADALiOS/ADLogger.m 43'></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-objc/pull/230#discussion_r21482065'>File: ADALiOS/ADALiOS/ADLogger.m:L112-121</a></b>
- <a href='https://github.com/omercs'><img border=0 src='https://avatars.githubusercontent.com/u/466805?v=3' height=16 width=16'></a> does it log as utc date?


<a href='https://www.codereviewhub.com/AzureAD/azure-activedirectory-library-for-objc/pull/230?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-objc/pull/230?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-objc/pull/230'><img src='http://www.codereviewhub.com/site/github-refresh.png' height=26></a>
<a href='#crh-end'></a>
if correlationid is not set, it should auto generate one.