Typos and minor changes to the security model requirements document.

Changes based on Janusz Majnert's email
Merge pull request #22 from jplyle/SecurityModelRequirements

Typo fixes and minor changes to the security model requirements document.
sysapps-runtime proposal initial draft from Samsung Electronics
Added proposal for a raw socket API based on Chrome Socket API.
Merge pull request #24 from ClaesNilsson/master

Raw Socket API
Merge pull request #23 from jungkees/master

System Application Runtime: Execution and Security Model (proposal from Samsung)
Move Intel's Contacts API proposal to a input_docs subfolder of the main Contacts proposal
replicating changes from J.M.Cantera's commit 2e4787dc65 to SMS API
Merge pull request #25 from otcshare/deprecate_contacts_intel

Move Intel's Contacts API proposal to a input_docs subfolder of the main proposal
editorial changes
removal of SMS.html superseeded by Messaging.html
Merge pull request #26 from efullea/sms

Removal of SMS.html superseeded by Messaging.html, plus editorials
Moved Telephony_Intel proposal to Telephony