Merge pull request #244 from khawkins/unstable20

Merging unstable into unstable20
Enforcing iOS 6 minimum requirements
Updating readme.md to reflect iOS 6 baseline requirement
Updating sample projects
Some readme edits
Additional readme update
Merge pull request #247 from khawkins/min_requirements

Updating minimum requirements to Xcode 4.5 / iOS 6
Merge remote-tracking branch 'origin/master' into unstable

Conflicts:
	dist/SalesforceSDK/SalesforceSDK-Debug.zip
	dist/SalesforceSDK/SalesforceSDK-Release.zip
	hybrid/SalesforceHybridSDK/SalesforceHybridSDK/Container/SFContainerAppDelegate.m
	native/SalesforceSDK/SalesforceSDK/Classes/SFRestAPI.m
Merge pull request #248 from khawkins/unstable

Merging master into unstable
Merge remote-tracking branch 'origin/unstable' into unstable20

Conflicts:
	dist/SalesforceSDK/SalesforceSDK-Debug.zip
	dist/SalesforceSDK/SalesforceSDK-Release.zip