LPS-45189 - 508 Compliance - Documents and Media portlet is missing form field labels

Hey @Preston-Crary,

Attached is an update for http://issues.liferay.com/browse/LPS-45189.  I updated this pull request with some additional changes, but it seems like we are still missing some scenarios.  If you look at the screen shot below:

![web content - liferay 2014-03-30 07-40-27](https://cloud.githubusercontent.com/assets/860951/2561493/10e3e69a-b81a-11e3-882f-d0b41ae42be7.png)

![welcome - liferay 2014-03-30 07-51-14](https://cloud.githubusercontent.com/assets/860951/2561503/cc31b47c-b81a-11e3-9272-fa4d0426e18d.png)

the search input still has the label visible when it should be hidden.  Also, in doing a search in liferay-portal, I saw that we are using ```label=""``` in some areas.  Now that we need the label to appear because of section 508 compliance, should we change the code where ```label=""``` to read ```hideLabel="<%= true %>"```?

Can you take a look and resend me a pull request?

Please let me know if you have any questions.  Thanks!