removed Application Manifest and its members

Now lives here:
https://github.com/sysapps/manifest
Added note as to where the App Manifest can now be found.
Fixed the wording a little bit.
Merge pull request #93 from marcoscaceres/removed_manifest

Removed Application Manifest and its members (closes #76)
added patent policy info
fixed typo
Use new w3.org URL.
Merge pull request #102 from mounirlamouri/gh-pages

Use new w3.org URL.